0001628280-26-045770 | 11-K | XBRL Viewer

Plan Description (Details) - EBP 005 - USD ($)	12 Months Ended
Plan Description (Details) - EBP 005 - USD ($)	Dec. 30, 2025	Dec. 30, 2024	Dec. 30, 2017
EBP, Description of Plan [Line Items]
Investment transferred from prior plan	$ 1,005,981	$ 1,100,264
Requisite service period	30 days
Employer contribution, participant compensation matched, percentage	3.00%		5.25%
Forfeited nonvested account	$ 318,940	31,855
Forfeited nonvested account, decrease from employer contribution	164,633	381,404
Note receivable from participant, minimum borrowing amount	1,000
Note receivable from participant, maximum borrowing amount	$ 50,000
Note receivable from participant, maximum borrowing, percentage	50.00%
Form 5500, note receivable, deemed distribution	$ 211,518	$ 167,694
Tranche One
EBP, Description of Plan [Line Items]
Employer contribution, participant compensation matched, percentage	3.00%
Employer contribution, matching percentage	100.00%
Tranche Two
EBP, Description of Plan [Line Items]
Employer contribution, participant compensation matched, percentage	3.00%
Employer contribution, matching percentage	50.00%
Minimum
EBP, Description of Plan [Line Items]
Participant contribution percentage	1.00%
Participant loan, interest rate	4.25%
Maximum
EBP, Description of Plan [Line Items]
Participant contribution percentage	50.00%
Participant loan, interest rate	9.50%

Fair Value Measurements (Details) - EBP 005 - USD ($)	12 Months Ended
Fair Value Measurements (Details) - EBP 005 - USD ($)	Dec. 30, 2025	Dec. 30, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	$ 230,927,099	$ 206,485,860
Prudential Core Plus Bond Fund Trust Class 5
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
Boston Partners Large Cap Value Equity Collective Trust Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
Invesco Stable Value Trust Class B1
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	12 months	12 months
LSV U.S. Small Cap Value Equity Tier 7
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
Principal Diversified Real Asset Collective Investment Trust Tier 1
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
William Blair Small Mid Cap Growth Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
State Street Russell Small/Mid Cap Index Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
State Street U.S. Bond Index NL Series Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
State Street S&P 500 Index Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
State Street Global All Cap Equity Ex U.S. Index Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
Winslow Large Cap Growth Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
JP Morgan US Government Market Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day
T. Rowe Price Retirement 2005 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2010 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2015 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2020 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2025 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2030 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2035 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2040 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2045 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2050 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2055 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2060 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2065 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day	1 day
T. Rowe Price Retirement 2070 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Redemption notice period	1 day
Fair Value Measured at Net Asset Value Per Share
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	$ 201,007,164	$ 174,912,791
Fair Value Measured at Net Asset Value Per Share \| Prudential Core Plus Bond Fund Trust Class 5
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	4,742,757	4,841,499
Fair Value Measured at Net Asset Value Per Share \| Boston Partners Large Cap Value Equity Collective Trust Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	7,638,361	6,637,986
Fair Value Measured at Net Asset Value Per Share \| Invesco Stable Value Trust Class B1
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	11,587,070	11,421,301
Fair Value Measured at Net Asset Value Per Share \| LSV U.S. Small Cap Value Equity Tier 7
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	735,654	1,014,352
Fair Value Measured at Net Asset Value Per Share \| Principal Diversified Real Asset Collective Investment Trust Tier 1
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	865,326	1,209,135
Fair Value Measured at Net Asset Value Per Share \| William Blair Small Mid Cap Growth Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	3,412,146	4,190,657
Fair Value Measured at Net Asset Value Per Share \| State Street Russell Small/Mid Cap Index Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	13,918,043	12,451,733
Fair Value Measured at Net Asset Value Per Share \| State Street U.S. Bond Index NL Series Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	3,532,005	4,125,426
Fair Value Measured at Net Asset Value Per Share \| State Street S&P 500 Index Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	30,138,218	25,334,160
Fair Value Measured at Net Asset Value Per Share \| State Street Global All Cap Equity Ex U.S. Index Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	5,010,090	3,640,128
Fair Value Measured at Net Asset Value Per Share \| Winslow Large Cap Growth Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	23,163,203	20,457,972
Fair Value Measured at Net Asset Value Per Share \| JP Morgan US Government Market Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	318,164
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2005 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	133,121	26,154
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2010 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	24,653	20,362
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2015 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	686,163	639,719
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2020 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	3,347,932	2,897,676
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2025 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	13,740,537	13,519,160
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2030 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	14,379,244	11,424,988
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2035 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	15,490,167	13,033,053
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2040 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	12,075,304	9,882,530
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2045 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	10,712,930	8,892,982
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2050 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	12,663,643	9,437,762
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2055 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	7,181,973	5,809,708
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2060 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	3,813,426	3,079,375
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2065 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	1,599,999	$ 924,973
Fair Value Measured at Net Asset Value Per Share \| T. Rowe Price Retirement 2070 Fund
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	$ 97,035

Fair Value Measurements

12 Months Ended

Dec. 30, 2025

EBP 005

EBP, Investment, Fair Value and NAV [Line Items]

Fair Value Measurements

Accounting guidance for the fair value measurement of financial assets and liabilities establishes a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurement) and the lowest priority to unobservable inputs (level 3 measurement). The three levels of the fair value hierarchy under this guidance are described below:

Basis of Fair Value Measurement:


Level 1	-	Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2	-	Quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3	-	Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The following tables set forth the Plan’s investment assets measured at fair value as of December 30,

2025 and 2024 within the fair value hierarchy, as well as investment assets measured at net asset value (“NAV”). As required by the accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.


	Assets at Fair Value as of
	December 30, 2025
	Level 1		Level 2		Level 3		Total
American States Water Company Common Stock Fund:
Common Stock	$	25,066,421	$	—	$	—	$	25,066,421
PIMCO Money Market Fund	795,679		—		—		795,679

Registered Investment Companies:
International Equity Fund	4,057,835		—		—		4,057,835

Total investments in fair value hierarchy	29,919,935		—		—		29,919,935

Total investments measured at net asset value (a)	—		—		—		201,007,164
Investments at fair value	$	29,919,935	$	—	$	—	$	230,927,099


	Assets at Fair Value as of
	December 30, 2024
	Level 1		Level 2		Level 3		Total
American States Water Company Common Stock Fund:
Common Stock	$	27,486,703	$	—	$	—	$	27,486,703
PIMCO Money Market Fund	1,137,942		—		—		1,137,942

Registered Investment Companies:
International Equity Funds	2,948,424		—		—		2,948,424

Total investments in fair value hierarchy	31,573,069		—		—		31,573,069

Total investments measured at net asset value (a)	—		—		—		174,912,791
Investments at fair value	$	31,573,069	$	—	$	—	$	206,485,860

(a) In accordance with the accounting guidance on fair value measurement, certain investments that were measured at net asset value per share (or its equivalent practical expedient) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the line item Investments at fair value, in the Statement of Net Assets Available for Plan Benefits.

The categorization of debt and equity securities is classified based on the nature and risk of the investment. The Plan’s investments that are measured at fair value on a recurring basis, such as the American States Water Company Common Stock Fund, which includes the money market fund and common stock, and the mutual funds included within the Registered Investment Companies are generally classified within Level 1 of the fair value hierarchy. The fair values of these investments are based on quoted market prices in active markets. The common collective trusts are measured at NAV of the units held. The NAV is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund less its liabilities. This practical expedient is not used when it is determined to be probable that the fund will sell the investment for an amount different than the reported NAV.

The following tables summarize investments for which fair value is measured using NAV per share:

Investments measured using NAV

2025 Fair Value

Unfunded Commitment

Redemption Frequency

Redemption Notice Period

Prudential Core Plus Bond Fund Trust Class 5

4,742,757

N/A

Daily

1 day

Boston Partners Large Cap Value Equity Collective Trust Fund

7,638,361

N/A

Daily

1 day

Invesco Stable Value Trust Class B1

11,587,070

N/A

Daily

12 months

LSV U.S. Small Cap Value Equity Tier 7

735,654

N/A

Daily

1 day

Principal Diversified Real Asset Tier 3

865,326

N/A

Daily

1 day

William Blair Small Mid Cap Growth Fund

3,412,146

N/A

Daily

1 day

State Street Russell Small/Mid Cap Index Fund

13,918,043

N/A

Daily

1 day

State Street U.S. Bond Index NL Series Fund

3,532,005

N/A

Daily

1 day

State Street S&P 500 Index Fund

30,138,218

N/A

Daily

1 day

State Street Global All Cap Equity Ex U.S. Index Fund

5,010,090

N/A

Daily

1 day

Winslow Large Cap Growth Fund

23,163,203

N/A

Daily

1 day

J.P. Morgan US Government Market Fund

318,164

N/A

Daily

1 day

T. Rowe Price Retirement 2005 Fund

133,121

N/A

Daily

1 day

T. Rowe Price Retirement 2010 Fund

24,653

N/A

Daily

1 day

T. Rowe Price Retirement 2015 Fund

686,163

N/A

Daily

1 day

T. Rowe Price Retirement 2020 Fund

3,347,932

N/A

Daily

1 day

T. Rowe Price Retirement 2025 Fund

13,740,537

N/A

Daily

1 day

T. Rowe Price Retirement 2030 Fund

14,379,244

N/A

Daily

1 day

T. Rowe Price Retirement 2035 Fund

15,490,167

N/A

Daily

1 day

T. Rowe Price Retirement 2040 Fund

12,075,304

N/A

Daily

1 day

T. Rowe Price Retirement 2045 Fund

10,712,930

N/A

Daily

1 day

T. Rowe Price Retirement 2050 Fund

12,663,643

N/A

Daily

1 day

T. Rowe Price Retirement 2055 Fund

7,181,973

N/A

Daily

1 day

T. Rowe Price Retirement 2060 Fund

3,813,426

N/A

Daily

1 day

T. Rowe Price Retirement 2065 Fund

1,599,999

N/A

Daily

1 day

T. Rowe Price Retirement 2070 Fund

97,035

N/A

Daily

1 day

Total investments measured using NAV

201,007,164

Investments measured using NAV

2024 Fair Value

Unfunded Commitment

Redemption Frequency

Redemption Notice Period

Prudential Core Plus Bond Fund Trust Class 5

4,841,499

N/A

Daily

1 day

Boston Partners Large Cap Value Equity Collective Trust Fund

6,637,986

N/A

Daily

1 day

Invesco Stable Value Trust Class B1

11,421,301

N/A

Daily

12 months

LSV U.S. Small Cap Value Equity Tier 7

1,014,352

N/A

Daily

1 day

Principal Diversified Real Asset Collective Investment Trust Tier 1

1,209,135

N/A

Daily

1 day

William Blair Small Mid Cap Growth Fund

4,190,657

N/A

Daily

1 day

State Street Russell Small/Mid Cap Index Fund

12,451,733

N/A

Daily

1 day

State Street U.S. Bond Index NL Series Fund

4,125,426

N/A

Daily

1 day

State Street S&P 500 Index Fund

25,334,160

N/A

Daily

1 day

State Street Global All Cap Equity Ex U.S. Index Fund

3,640,128

N/A

Daily

1 day

Winslow Large Cap Growth Fund

20,457,972

N/A

Daily

1 day

T. Rowe Price Retirement 2005 Fund

26,154

N/A

Daily

1 day

T. Rowe Price Retirement 2010 Fund

20,362

N/A

Daily

1 day

T. Rowe Price Retirement 2015 Fund

639,719

N/A

Daily

1 day

T. Rowe Price Retirement 2020 Fund

2,897,676

N/A

Daily

1 day

T. Rowe Price Retirement 2025 Fund

13,519,160

N/A

Daily

1 day

T. Rowe Price Retirement 2030 Fund

11,424,988

N/A

Daily

1 day

T. Rowe Price Retirement 2035 Fund

13,033,053

N/A

Daily

1 day

T. Rowe Price Retirement 2040 Fund

9,882,530

N/A

Daily

1 day

T. Rowe Price Retirement 2045 Fund

8,892,982

N/A

Daily

1 day

T. Rowe Price Retirement 2050 Fund

9,437,762

N/A

Daily

1 day

T. Rowe Price Retirement 2055 Fund

5,809,708

N/A

Daily

1 day

T. Rowe Price Retirement 2060 Fund

3,079,375

N/A

Daily

1 day

T. Rowe Price Retirement 2065 Fund

924,973

N/A

Daily

1 day

Total investments measured using NAV

174,912,791

There are no plan liabilities recorded at fair value at December 30, 2025 or 2024.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

The entire disclosure for fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(3)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-02(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 16: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-23

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-6

+ Details

Plan Description	12 Months Ended
Plan Description	Dec. 30, 2025
EBP 005
EBP, Description of Plan [Line Items]
Plan Description	Plan Description The following description of the Golden State Water Company Investment Incentive Program (the “Plan”) provides only general information. Participants should refer to the Plan document for a more complete description of the Plan’s provisions. General The Plan is a defined contribution plan established by Golden State Water Company (the “Company” or “GSWC”) under the provisions of Section 401(a) of the Internal Revenue Code (the “IRC”) which includes a qualified cash or deferred arrangement as described in Section 401(k) of the IRC, for the benefit of eligible employees. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). Prior to inception of the Plan, the Company maintained the Payroll-Based Tax Credit Employee Stock Ownership Plan (the “PAYSOP”) for the benefit of participating employees and their beneficiaries. Under the PAYSOP, the Company contributed amounts equal to a tax credit claimed by the Company on its federal income tax return. This credit was calculated as a percentage of qualifying payroll. The Tax Reform Act of 1986 eliminated this credit for tax years after 1986. As a result, the Company terminated the PAYSOP and transferred the net assets into the Plan effective January 1, 1988. The trustee of the Plan maintains a separate account for the net assets that were transferred from the PAYSOP. The net assets relating to the PAYSOP amounted to $1,005,981 and $1,100,264 as of December 30, 2025 and 2024, respectively. Such net assets as of December 30, 2025 and 2024 are participant directed investments. In 1998, the Company formed a holding company, American States Water Company (“ASWC”). At the time of the formation, the Plan’s investments in the Company’s common stock changed to an investment in ASWC common stock. As of December 30, 2025, ASWC has no material assets other than the common stock of the Company and its other wholly-owned subsidiaries, Bear Valley Electric Service, Inc. (“BVES”) and American States Utility Services, Inc. (“ASUS”). Plan Administration The Plan is administered by the Investment Incentive Program Administrative Committee (the “Plan Administrator” or “Committee”), which is appointed by GSWC’s Board of Directors. John Hancock Retirement Plan Services provides the record keeping services and John Hancock Trust Company, LLC (“Trustee”) serves as the Plan’s appointed trustee. ASWC Common Stock Fund Effective January 1, 2003, the ASWC Common Stock Fund was deemed an ‘employee stock ownership plan’ within the meaning of Section 4975(e)(7) of the IRC and ERISA Section 407(d)(6) that is intended to invest primarily in the common stock of ASWC. Eligibility Any employee in participating business units who has completed a period of service of 30 consecutive days is eligible to participate in the Plan. The Plan provides for automatic enrollment. Participation begins on the first day of the payroll period coincident with or next, following the attainment of 30 consecutive days of service. Participating business units include GSWC, BVES, corporate employees of ASUS, and exempt employees of ASUS’s subsidiaries. The Plan was amended in December 2014 to allow non-exempt employees of ASUS’s subsidiaries to participate, effective January 1, 2015. Non-exempt employees of ASUS’s subsidiaries hired on or after January 1, 2015 are automatically eligible to participate in the Plan. Those hired before January 1, 2015 are covered under separate benefit programs if they did not elect to participate in the Plan. Eligible employees meeting the service requirements are auto-enrolled in the Plan at an employee contribution rate of three percent. This will generate a dollar for dollar employer matching contribution up to the limits described below. Employees are given the option to elect additional contributions, to decline contributions altogether, or to remain at three percent. Furthermore, employees are requested to select the funds into which their contribution will be deposited. The default fund for employees making no elections is the appropriate T. Rowe Price Retirement Fund, based on the employee’s expected retirement date. Eligible employees hired or rehired on or after January 1, 2011 are auto-enrolled in the Profit Sharing feature of the Plan, once they have completed a period of service of 30 consecutive days. The Plan was amended in 2018 to cover all ASUS employees previously excluded from the Plan, unless the employee currently accrues benefits under the Defined Benefit Pension Plan, which has been closed to new employees since December 31, 2010. Company profit sharing contributions amount to 5.25% of eligible pay for GSWC and BVES employees. The 2018 plan amendment changed the Company profit sharing contribution for ASUS employees from 5.25% to 3%. All Company contributions are deposited into employee directed funds. Employees may elect to direct these contributions into any fund available under the Plan, except the ASWC Common Stock Fund. The default fund for employees making no elections is the appropriate T. Rowe Price Retirement Fund, based on the employee’s expected retirement date. Contributions Eligible employees can contribute an amount between 1% and 50% of compensation as defined in the Plan document and amendments, subject to certain IRC limitations. Participants who have attained age 50 before the end of the Plan year, who have met the annual IRC deferral limit or the specified Plan limits for deferral, are eligible to make catch-up contributions, subject to certain IRC limitations. In addition, eligible employees are provided with matching employer contributions to their accounts of 100 percent of the first 3% and 50 percent of the next 3% contributed by a participant. At the end of the Plan year, the Company may make an additional matching contribution for each dollar participants contribute up to the full matching contribution (“True-Up Contribution”). Participants must be employed on the last day of the Plan year in order to receive the True-Up Contribution, if any. The matching contribution for each participant is made to the same investment funds to which the participant’s compensation deferral contribution is made in a given payroll period. If the participant’s contribution is to any fund other than the ASWC Common Stock Fund, the match is made in cash. If the matching contribution is made to the ASWC Common Stock Fund, the Plan has the option to fund the match in cash and ASWC Common Stock, or entirely in cash. For the Plan year ended December 30, 2025, all Company matching contributions to the ASWC Common Stock were made in cash. All investments are participant directed. Employees may elect to contribute to the Plan in the traditional pre-tax manner, or contribute post-tax dollars to the Roth portion of the Plan. Employee contributions may be split between Roth and traditional pre-tax, but the matching provisions of the Plan relating to the amount of contributions and Company matching contributions will apply to the total. Company matching contributions are always made in pre-tax dollars. Rollover contributions from qualified plans are permitted. Employees cannot make contributions to the Profit Sharing program. Vesting Plan participants are always fully vested in their contributions and the employer matching contributions made to their account, plus actual earnings thereon. Profit Sharing contributions, plus actual earnings thereon, vest when the participant attains three years of service. Distribution of Benefits Participants’ benefits under the Plan become distributable upon termination of service, as defined in the Plan document. Participants electing to have their distribution deferred will receive benefits equal to the amounts credited to their account as of the distribution value date, as defined in the Plan document. The value of benefits distributable to a participant not electing deferral is based upon amounts credited to the participants account under the Plan as of the distribution value date, except as described below. A participant shall be entitled to request an in-service withdrawal of the lesser of the balance of their account or the total unwithdrawn deferral contributions after the participant has attained age 59 1/2. Subject to the approval of the Plan Administrator, withdrawals from a participant’s vested account before age 59 1/2 may be permitted to meet a financial hardship, as defined in the Plan document. The Plan was amended effective January 1, 2020, to reflect final regulations published by the Internal Revenue Service (“IRS”) on hardship distributions under Investment Incentive (401k) Plans. Otherwise, withdrawals from a Plan participant’s vested account are permitted only after termination of employment or upon death or total disability. A participant who has attained age 55 and completed at least ten years of participation in the Plan (including any years of participation in the PAYSOP) may elect a distribution of a portion of the participant’s PAYSOP account attributable to shares of ASWC Common Stock after December 31, 1986, as provided in Section 401(a)(28)(B) of the IRC. Participant Accounts Each Plan participant’s account is credited or debited with the participant’s contributions and/or employer contributions, as well as the participant’s share of the Plan’s earnings or losses. Certain administrative expenses are charged directly to a specific participant’s account. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s account balance. Forfeitures When a Participant incurs a severance from service when they are not 100% vested in their Profit Sharing Account, the unvested portion of such accounts shall be forfeited. Any amount that has been forfeited under the Plan shall be applied first to pay expenses and fees in connection with the administration of the Plan and then, to the extent that any such forfeitures remain, shall be used to reduce Employer contributions. As of December 30, 2025 and 2024, there were $318,940 and $31,855, respectively, of unused forfeitures. For the Plan years ended December 30, 2025 and 2024, forfeitures used to pay plan fees and to reduce Employer contributions were $164,633 and $381,404, respectively. Notes Receivable from Participants Notes receivable from participants consist of participants’ loans borrowed on their eligible accounts. Participants may not borrow on their profit sharing balances. Participants may borrow from their eligible account a minimum of $1,000 and up to a maximum amount equal to the lesser of $50,000 or 50% of their account balance. Loan transactions are treated as a transfer between the investment fund and the Participant Loan Fund. Principal and interest are repayable ratably through payroll deductions over a period of no more than 59 months for all loans, except for loans made to purchase a primary residence, which must be repaid within a period of no more than 10 years. The loans bear interest at prime rate plus one percent. The interest rates on loans outstanding as of December 30, 2025 ranged from 4.25% to 9.50% and mature on various dates through 2035. A loan shall be in default if any scheduled payment is not paid by the last day of the calendar quarter following the calendar quarter in which such scheduled payment was due. A participant who terminates employment and has an outstanding loan balance may continue to make payments directly to the Trustee in order to avoid default. Management determines the collectability of participant loans on a periodic basis. This determination is made based on the terms of the Plan document and the related Plan policies and procedures. Those participant loans that are deemed uncollectible are reserved and included as loans in default in the financial statements and the Form 5500 in the year the determination is made. As of December 30, 2025 and 2024, participant loans deemed uncollectible were $211,518 and $167,694, respectively.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 30, 2025

EBP 005

EBP, Investment, Fair Value and NAV [Line Items]

EBP, Investment, Fair Value and NAV

The following tables set forth the Plan’s investment assets measured at fair value as of December 30,


	Assets at Fair Value as of
	December 30, 2025
	Level 1		Level 2		Level 3		Total
American States Water Company Common Stock Fund:
Common Stock	$	25,066,421	$	—	$	—	$	25,066,421
PIMCO Money Market Fund	795,679		—		—		795,679

Registered Investment Companies:
International Equity Fund	4,057,835		—		—		4,057,835

Total investments in fair value hierarchy	29,919,935		—		—		29,919,935

Total investments measured at net asset value (a)	—		—		—		201,007,164
Investments at fair value	$	29,919,935	$	—	$	—	$	230,927,099


	Assets at Fair Value as of
	December 30, 2024
	Level 1		Level 2		Level 3		Total
American States Water Company Common Stock Fund:
Common Stock	$	27,486,703	$	—	$	—	$	27,486,703
PIMCO Money Market Fund	1,137,942		—		—		1,137,942

Registered Investment Companies:
International Equity Funds	2,948,424		—		—		2,948,424

Total investments in fair value hierarchy	31,573,069		—		—		31,573,069

Total investments measured at net asset value (a)	—		—		—		174,912,791
Investments at fair value	$	31,573,069	$	—	$	—	$	206,485,860

The following tables summarize investments for which fair value is measured using NAV per share:

Investments measured using NAV

2025 Fair Value

Unfunded Commitment

Redemption Frequency

Redemption Notice Period

Prudential Core Plus Bond Fund Trust Class 5

4,742,757

N/A

Daily

1 day

Boston Partners Large Cap Value Equity Collective Trust Fund

7,638,361

N/A

Daily

1 day

Invesco Stable Value Trust Class B1

11,587,070

N/A

Daily

12 months

LSV U.S. Small Cap Value Equity Tier 7

735,654

N/A

Daily

1 day

Principal Diversified Real Asset Tier 3

865,326

N/A

Daily

1 day

William Blair Small Mid Cap Growth Fund

3,412,146

N/A

Daily

1 day

State Street Russell Small/Mid Cap Index Fund

13,918,043

N/A

Daily

1 day

State Street U.S. Bond Index NL Series Fund

3,532,005

N/A

Daily

1 day

State Street S&P 500 Index Fund

30,138,218

N/A

Daily

1 day

State Street Global All Cap Equity Ex U.S. Index Fund

5,010,090

N/A

Daily

1 day

Winslow Large Cap Growth Fund

23,163,203

N/A

Daily

1 day

J.P. Morgan US Government Market Fund

318,164

N/A

Daily

1 day

T. Rowe Price Retirement 2005 Fund

133,121

N/A

Daily

1 day

T. Rowe Price Retirement 2010 Fund

24,653

N/A

Daily

1 day

T. Rowe Price Retirement 2015 Fund

686,163

N/A

Daily

1 day

T. Rowe Price Retirement 2020 Fund

3,347,932

N/A

Daily

1 day

T. Rowe Price Retirement 2025 Fund

13,740,537

N/A

Daily

1 day

T. Rowe Price Retirement 2030 Fund

14,379,244

N/A

Daily

1 day

T. Rowe Price Retirement 2035 Fund

15,490,167

N/A

Daily

1 day

T. Rowe Price Retirement 2040 Fund

12,075,304

N/A

Daily

1 day

T. Rowe Price Retirement 2045 Fund

10,712,930

N/A

Daily

1 day

T. Rowe Price Retirement 2050 Fund

12,663,643

N/A

Daily

1 day

T. Rowe Price Retirement 2055 Fund

7,181,973

N/A

Daily

1 day

T. Rowe Price Retirement 2060 Fund

3,813,426

N/A

Daily

1 day

T. Rowe Price Retirement 2065 Fund

1,599,999

N/A

Daily

1 day

T. Rowe Price Retirement 2070 Fund

97,035

N/A

Daily

1 day

Total investments measured using NAV

201,007,164

Investments measured using NAV

2024 Fair Value

Unfunded Commitment

Redemption Frequency

Redemption Notice Period

Prudential Core Plus Bond Fund Trust Class 5

4,841,499

N/A

Daily

1 day

Boston Partners Large Cap Value Equity Collective Trust Fund

6,637,986

N/A

Daily

1 day

Invesco Stable Value Trust Class B1

11,421,301

N/A

Daily

12 months

LSV U.S. Small Cap Value Equity Tier 7

1,014,352

N/A

Daily

1 day

Principal Diversified Real Asset Collective Investment Trust Tier 1

1,209,135

N/A

Daily

1 day

William Blair Small Mid Cap Growth Fund

4,190,657

N/A

Daily

1 day

State Street Russell Small/Mid Cap Index Fund

12,451,733

N/A

Daily

1 day

State Street U.S. Bond Index NL Series Fund

4,125,426

N/A

Daily

1 day

State Street S&P 500 Index Fund

25,334,160

N/A

Daily

1 day

State Street Global All Cap Equity Ex U.S. Index Fund

3,640,128

N/A

Daily

1 day

Winslow Large Cap Growth Fund

20,457,972

N/A

Daily

1 day

T. Rowe Price Retirement 2005 Fund

26,154

N/A

Daily

1 day

T. Rowe Price Retirement 2010 Fund

20,362

N/A

Daily

1 day

T. Rowe Price Retirement 2015 Fund

639,719

N/A

Daily

1 day

T. Rowe Price Retirement 2020 Fund

2,897,676

N/A

Daily

1 day

T. Rowe Price Retirement 2025 Fund

13,519,160

N/A

Daily

1 day

T. Rowe Price Retirement 2030 Fund

11,424,988

N/A

Daily

1 day

T. Rowe Price Retirement 2035 Fund

13,033,053

N/A

Daily

1 day

T. Rowe Price Retirement 2040 Fund

9,882,530

N/A

Daily

1 day

T. Rowe Price Retirement 2045 Fund

8,892,982

N/A

Daily

1 day

T. Rowe Price Retirement 2050 Fund

9,437,762

N/A

Daily

1 day

T. Rowe Price Retirement 2055 Fund

5,809,708

N/A

Daily

1 day

T. Rowe Price Retirement 2060 Fund

3,079,375

N/A

Daily

1 day

T. Rowe Price Retirement 2065 Fund

924,973

N/A

Daily

1 day

Total investments measured using NAV

174,912,791

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Tabular disclosure of fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

+ Details

Related-Party and Party-in-Interest Transactions (Details) - EBP 005 - USD ($)	12 Months Ended
	Dec. 30, 2025	Dec. 30, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Investment acquired market cost	$ 5,363,067	$ 5,729,072
Investment sold at selling price	7,218,504	7,173,837
Increase from dividend income on investment	$ 721,271	$ 688,515

Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 005 - USD ($)	12 Months Ended
	Dec. 30, 2025	Dec. 30, 2024
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	95-1243678
Plan number	005
Total investments	$ 230,927,099
Participant loan, current value	3,257,645
Asset held for investment	$ 234,184,744
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	4.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	9.50%
Common stocks
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	$ 25,862,100	$ 28,624,645
Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	201,007,164
Investment, Identifier [Axis]: American States Water Company Common Stock
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	25,066,421
Investment, Identifier [Axis]: Boston Partners Large Cap Value Equity CTF
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	7,638,361
Investment, Identifier [Axis]: Dodge & Cox International Stock Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	4,057,835
Investment, Identifier [Axis]: Invesco Stable Value Trust Class B1
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	11,587,070
Investment, Identifier [Axis]: JP Morgan US Government Market Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	318,164
Investment, Identifier [Axis]: LSV U.S. Small Cap Value Equity Tier 7
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	735,654
Investment, Identifier [Axis]: PIMCO Money Market Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	795,679
Investment, Identifier [Axis]: Principal Diversified Real Asset Tier 3
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	865,326
Investment, Identifier [Axis]: Prudential Core Plus Bond Fund Trust Class 5
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	4,742,757
Investment, Identifier [Axis]: State Street Global All Cap Equity Ex U.S. Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	5,010,090
Investment, Identifier [Axis]: State Street Russell Small/Mid Cap Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	13,918,043
Investment, Identifier [Axis]: State Street S&P 500 Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	30,138,218
Investment, Identifier [Axis]: State Street U.S. Bond Index NL Series Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	3,532,005
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2005 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	133,121
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2010 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	24,653
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2015 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	686,163
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2020 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	3,347,932
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2025 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	13,740,537
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2030 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	14,379,244
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2035 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	15,490,167
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2040 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	12,075,304
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2045 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	10,712,930
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2050 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	12,663,643
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2055 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	7,181,973
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2060 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	3,813,426
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2065 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	1,599,999
Investment, Identifier [Axis]: T. Rowe Price \| Retirement 2070 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	97,035
Investment, Identifier [Axis]: William Blair Small Mid Cap Growth Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	3,412,146
Investment, Identifier [Axis]: Winslow Large Cap Growth Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total investments	$ 23,163,203

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 30, 2025
EBP 005
EBP, Accounting Policy [Line Items]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Accounting The accompanying financial statements are prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Plan’s management to make estimates and assumptions that affect the reported amounts of assets, liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could materially differ from those estimates. Risks and Uncertainties The Plan’s investment in the ASWC Common Stock Fund amounted to $25,862,100 and $28,624,645 as of December 30, 2025 and 2024, respectively. Such investments represented approximately 11% and 14% of the Plan’s total net assets as of December 30, 2025 and 2024, respectively. For risks and uncertainties regarding ASWC, participants should refer to ASWC’s most recent Form 10-K and Form 10-Q filed with the Securities and Exchange Commission. The Plan provides for various investment options in mutual funds, common and collective trust investment funds, and the ASWC Common Stock Fund. Such investment options are exposed to various risks such as interest rate, market and credit risk. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in the various risk factors in the near term could materially affect the amounts reported in the financial statements. The Plan invests in common and collective trust investment funds that hold securities of foreign companies, which involve special risks and considerations not typically associated with investing in U.S. companies. These risks include devaluation of currencies, less reliable information about issuers, different securities transactions and changes in foreign currency translation clearance and settlement practices, and possible adverse political and economic developments. Moreover, securities of many foreign companies and their markets may be less liquid and their prices more volatile than those of securities of comparable U.S. companies. Contributions Participant contributions, related matching contributions and profit-sharing contributions are recognized in the Plan year during which the Company makes payroll deductions from the participant's compensation. Investment Valuation Investments are stated at fair value. Net Appreciation in Fair Value of Investments and Income Recognition Net appreciation in fair value of investments is based on the fair value of the assets at the beginning of the year or at the time of purchase for assets purchased during the year and the related fair values on the day investments are sold with respect to realized gains and losses, and on the last day of the year with respect to unrealized gains and losses. Net realized and unrealized appreciation (depreciation) is recorded in the accompanying Statement of Changes in Net Assets Available for Plan Benefits as net appreciation (depreciation) in fair value of investments. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Notes Receivable from Participants Notes receivable from participants are measured at their unpaid principal balance. Accrued but unpaid interest was insignificant at December 30, 2025 and 2024. Delinquent participant loans are reclassified as distributions based upon the terms of the Plan document. Payment of Benefits Benefits are recorded when paid. Administrative Expenses Administrative fees for accountants, legal counsel and other specialists and any other costs of administering the Plan, unless paid directly by the Company, are paid by the Plan and charged against participants’ accounts or paid by forfeitures. Certain administrative expenses directly relating to a participant’s account, such as loan processing fees, are specifically allocated and deducted from the specific participant’s account. The Company is not obligated to pay the Plan’s expenses and any Plan expenses paid by the Company are excluded from these financial statements. Administrative expenses incurred related to the net assets of the former PAYSOP account that are paid out of the Plan are limited to the lesser of (i) the sum of 10 percent of the first $100,000 and 5 percent of any amount in excess of $100,000 of the income from dividends paid to the Plan with respect to ASWC common stock allocated to the PAYSOP account during the Plan year, or (ii) $100,000. Subsequent Events Management has evaluated subsequent events through June 26, 2026, the date the financial statements were available to be filed and has determined that there were no material events requiring recognition or disclosure.

Fair Value Measurements (Details) - EBP 005 - USD ($)	Dec. 30, 2025	Dec. 30, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	$ 230,927,099	$ 206,485,860
EBP, Employer, Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	25,066,421	27,486,703
EBP, Nonemployer, Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	795,679	1,137,942
Equity Funds
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	4,057,835	2,948,424
Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	29,919,935	31,573,069
Fair Value, Inputs, Level 1 \| EBP, Employer, Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value		27,486,703
Fair Value, Inputs, Level 1 \| EBP, Nonemployer, Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value		1,137,942
Fair Value, Inputs, Level 1 \| Equity Funds
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	4,057,835	2,948,424
Fair Value, Inputs, Level 1, Level 2, and Level 3
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	29,919,935	31,573,069
Fair Value Measured at Net Asset Value Per Share
EBP, Investment, Fair Value and NAV [Line Items]
Investment at fair value	$ 201,007,164	$ 174,912,791

- Definition

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Summary of Significant Accounting Policies (Policies) - EBP 005	12 Months Ended
	Dec. 30, 2025
EBP, Accounting Policy [Line Items]
Basis of Accounting	Basis of Accounting The accompanying financial statements are prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Plan’s management to make estimates and assumptions that affect the reported amounts of assets, liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could materially differ from those estimates.
Risks and Uncertainties	Risks and Uncertainties The Plan’s investment in the ASWC Common Stock Fund amounted to $25,862,100 and $28,624,645 as of December 30, 2025 and 2024, respectively. Such investments represented approximately 11% and 14% of the Plan’s total net assets as of December 30, 2025 and 2024, respectively. For risks and uncertainties regarding ASWC, participants should refer to ASWC’s most recent Form 10-K and Form 10-Q filed with the Securities and Exchange Commission. The Plan provides for various investment options in mutual funds, common and collective trust investment funds, and the ASWC Common Stock Fund. Such investment options are exposed to various risks such as interest rate, market and credit risk. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in the various risk factors in the near term could materially affect the amounts reported in the financial statements. The Plan invests in common and collective trust investment funds that hold securities of foreign companies, which involve special risks and considerations not typically associated with investing in U.S. companies. These risks include devaluation of currencies, less reliable information about issuers, different securities transactions and changes in foreign currency translation clearance and settlement practices, and possible adverse political and economic developments. Moreover, securities of many foreign companies and their markets may be less liquid and their prices more volatile than those of securities of comparable U.S. companies.
Contributions	Contributions Participant contributions, related matching contributions and profit-sharing contributions are recognized in the Plan year during which the Company makes payroll deductions from the participant's compensation.
Investment Valuation and Net Appreciation in Fair Value of Investments and Income Recognition	Investment Valuation Investments are stated at fair value. Net Appreciation in Fair Value of Investments and Income Recognition Net appreciation in fair value of investments is based on the fair value of the assets at the beginning of the year or at the time of purchase for assets purchased during the year and the related fair values on the day investments are sold with respect to realized gains and losses, and on the last day of the year with respect to unrealized gains and losses. Net realized and unrealized appreciation (depreciation) is recorded in the accompanying Statement of Changes in Net Assets Available for Plan Benefits as net appreciation (depreciation) in fair value of investments. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date.
Note Receivable from Participants	Notes Receivable from Participants Notes receivable from participants are measured at their unpaid principal balance. Accrued but unpaid interest was insignificant at December 30, 2025 and 2024. Delinquent participant loans are reclassified as distributions based upon the terms of the Plan document.
Payment of Benefits	Payment of Benefits Benefits are recorded when paid.
Administrative Expenses	Administrative Expenses Administrative fees for accountants, legal counsel and other specialists and any other costs of administering the Plan, unless paid directly by the Company, are paid by the Plan and charged against participants’ accounts or paid by forfeitures. Certain administrative expenses directly relating to a participant’s account, such as loan processing fees, are specifically allocated and deducted from the specific participant’s account. The Company is not obligated to pay the Plan’s expenses and any Plan expenses paid by the Company are excluded from these financial statements. Administrative expenses incurred related to the net assets of the former PAYSOP account that are paid out of the Plan are limited to the lesser of (i) the sum of 10 percent of the first $100,000 and 5 percent of any amount in excess of $100,000 of the income from dividends paid to the Plan with respect to ASWC common stock allocated to the PAYSOP account during the Plan year, or (ii) $100,000.
Subsequent Events	Subsequent Events Management has evaluated subsequent events through June 26, 2026, the date the financial statements were available to be filed and has determined that there were no material events requiring recognition or disclosure.

Statement of Changes in Net Assets Available for Benefits - EBP 005	12 Months Ended
	Dec. 30, 2025 USD ($)
Contributions:
Employee	$ 7,651,470
Employee rollovers	1,033,102
Employer, net of forfeitures	6,130,888
Total contributions	14,815,460
Net investment income:
Net appreciation in fair value of investments	26,195,513
Interest and dividends	1,266,290
Total net investment income	27,461,803
Interest income on notes receivable from participants	268,365
Total net additions	42,545,628
Deductions:
Benefits paid to participants and change in defaulted notes receivable from participants	17,716,409
Administrative and other expenses	321,904
Total deductions	18,038,313
Net increase	24,507,315
Net assets available for benefits at beginning of year	209,677,429
Net assets available for benefits at end of year	$ 234,184,744

Statements of Net Assets Available for Benefits - EBP 005 - USD ($)	Dec. 30, 2025	Dec. 30, 2024
Assets
Investment at fair value	$ 230,927,099	$ 206,485,860
Receivables:
Employer contributions receivable, net of forfeitures	0	122,211
Employee contributions receivable	0	5,724
Notes receivable from participants, net of reserve	3,257,645	3,063,634
Total receivables	3,257,645	3,191,569
Net assets available for benefits	$ 234,184,744	$ 209,677,429

Amount of asset less liability available to pay benefit of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, aggregation of participants' individual account balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Schedule H, Line 4i – Schedule of Assets (Held At End of Year)

12 Months Ended

Dec. 30, 2025

EBP 005

EBP, Schedule of Asset Held for Investment [Line Items]

Schedule H, Line 4i – Schedule of Assets (Held At End of Year)

Golden State Water Company

Investment Incentive Program

Form 5500 - Schedule H - Line 4i -

Schedule of Assets (Held at End of Year) as of December 30, 2025

EIN: 95-1243678

Plan Number: 005


	(c) Description of investment
(a)(b) Identity of issuer, borrower,	including maturity dates, rate of	(d)	(e) Current
lessor, or similar party	interest, par or maturity value	Cost	Value
Common Stock:
* American States Water Company	American States Water Company Stock Fund:
	PIMCO Money Market Fund	**	$	795,679
	American States Water Company Common Stock	**	25,066,421
			25,862,100

Registered Investment Companies:
Dodge & Cox	Dodge & Cox International Stock Fund	**	4,057,835


Common/Collective Trust Funds:
Prudential	Prudential Core Plus Bond Fund Trust Class 5	**	4,742,757
Boston Partners	Boston Partners Large Cap Value Equity CTF	**	7,638,361
Invesco	Invesco Stable Value Trust Class B1	**	11,587,070
LSV	LSV U.S. Small Cap Value Equity Tier 7	**	735,654
Principal	Principal Diversified Real Asset Tier 3	**	865,326
William Blair	William Blair Small Mid Cap Growth Fund	**	3,412,146
State Street	State Street Russell Small/Mid Cap Index Fund	**	13,918,043
State Street	State Street U.S. Bond Index NL Series Fund	**	3,532,005
State Street	State Street S&P 500 Index Fund	**	30,138,218
State Street	State Street Global All Cap Equity Ex U.S. Index Fund	**	5,010,090
Winslow	Winslow Large Cap Growth Fund	**	23,163,203
J.P. Morgan	US Government Market Fund	**	318,164
T. Rowe Price	Retirement 2005 Fund	**	133,121
T. Rowe Price	Retirement 2010 Fund	**	24,653
T. Rowe Price	Retirement 2015 Fund	**	686,163
T. Rowe Price	Retirement 2020 Fund	**	3,347,932
T. Rowe Price	Retirement 2025 Fund	**	13,740,537
T. Rowe Price	Retirement 2030 Fund	**	14,379,244
T. Rowe Price	Retirement 2035 Fund	**	15,490,167
T. Rowe Price	Retirement 2040 Fund	**	12,075,304
T. Rowe Price	Retirement 2045 Fund	**	10,712,930
T. Rowe Price	Retirement 2050 Fund	**	12,663,643
T. Rowe Price	Retirement 2055 Fund	**	7,181,973
T. Rowe Price	Retirement 2060 Fund	**	3,813,426
T. Rowe Price	Retirement 2065 Fund	**	1,599,999
T. Rowe Price	Retirement 2070 Fund	**	97,035

			201,007,164

Total investments			230,927,099

*Notes receivable from participants, net of reserve	Notes with maturities through 2035, interest
	rates ranging from 4.25% to 9.50%	**	3,257,645
			$	234,184,744

* Represents a party-in-interest as defined by ERISA.

** The cost is only required for non-participant directed investments.

Plan Termination	12 Months Ended
Plan Termination	Dec. 30, 2025
EBP 005
EBP, Plan Termination [Line Items]
Plan Termination	Plan Termination Although it has not expressed any intent to do so, the Company has the right under the Plan document to discontinue its contributions at any time and to amend or terminate the Plan subject to the provisions of ERISA.

Cover	12 Months Ended
Cover	Dec. 30, 2025
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	American States Water Company
Amendment Flag	false
Entity Central Index Key	0001056903
EBP 005
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	American States Water Company
Amendment Flag	false
Entity Central Index Key	0001056903

Investment Options	12 Months Ended
Investment Options	Dec. 30, 2025
EBP 005
EBP, Fully Benefit-Responsive Investment Contract [Line Items]
Investment Options	Investment OptionsParticipants may direct their investment into various fund options and may change their investment elections on a daily basis, in full percentage increments. Certain participants may be restricted to specific periods during which ASWC common stock can be traded. Participants should refer to the fund information provided by the Trustee for a complete description of the investment options and detailed composition of each investment fund.

Tax Status	12 Months Ended
Tax Status	Dec. 30, 2025
EBP 005
EBP, Tax Status [Line Items]
Tax Status	Tax Status The IRS issued a favorable determination letter dated March 4, 2016 stating that the Plan and its related trust are designed in accordance with applicable IRC requirements as of that date. The determination letter covered amendments through February 18, 2014. Although the Plan has since been amended, the Plan Administrator believes that the Plan continues to be designed and operated in compliance with the IRC. Consequently, the Plan Administrator believes that the Plan has remained qualified, its related trust has therefore been tax-exempt, including as of December 30, 2025 and 2024, and for the Plan year ended December 30, 2025. Accordingly, no provision for income taxes has been included in the Plan’s financial statements. The Plan is subject to routine audits by the IRS; however, there are currently no audits in progress. Accounting principles generally accepted in the United States of America require Plan management to evaluate uncertain income tax positions taken, or planned to be taken, by the Plan, and for the Plan’s trust to recognize a tax liability (or asset) if such a position is not “more likely than not” to be sustained upon examination by the IRS that would result in disqualification of the Plan. Because of the Plan Administrator’s belief that the Plan is, and will remain, qualified, including based on all tax positions it has taken, it has concluded that, as of December 30, 2025, there are no tax liabilities (or assets) for which recognition or disclosure is required in the financial statements.