CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities:
Net Income	$ 119,268	$ 124,921	$ 78,396
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,226	43,254	41,697
Provision for doubtful accounts	1,653	932	1,043
Deferred income taxes and investment tax credits	2,042	4,783	2,803
Stock-based compensation expense	3,744	3,298	2,571
(Gain) loss on investments held in a trust	(5,293)	(5,008)	5,177
Other — net	187	289	38
Changes in assets and liabilities:
Accounts receivable — customers	(5,110)	(6,632)	5,424
Unbilled receivable	(3,468)	(1,283)	9,699
Other accounts receivable	(369)	(2,241)	2,115
Unbilled receivable	15,003	(6,033)	(5,638)
Materials and supplies	2,434	(2,951)	(2,460)
Prepayments and other assets	32	1,581	3,146
Contract assets	(7,270)	604	(5,395)
Regulatory assets/liabilities	18,487	(81,373)	(18,915)
Accounts payable	5,152	(10,862)	11,767
Income taxes receivable/payable	(24)	2,493	(6,479)
Contract liabilities	4,310	449	646
Accrued pension and other post-retirement benefits	(208)	1,046	(3,087)
Other liabilities	3,936	416	(4,749)
Net cash provided (used)	198,732	67,683	117,799
Cash Flows From Investing Activities:
Capital expenditures	(231,960)	(188,540)	(166,240)
Other investing activities	(820)	(224)	(862)
Net cash provided (used)	(232,780)	(188,764)	(167,102)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	88,814	0	0
Receipt of advances for and contributions in aid of construction	11,195	11,889	6,901
Refunds on advances for construction	(4,919)	(4,540)	(5,321)
Repayments of long-term debt	(370)	(334)	(377)
Proceeds from the issuance of long-term debt, net of issuance costs	64,569	129,665	34,789
Net changes in notes payable to banks	(44,500)	54,590	72,000
Dividends paid	(67,017)	(61,195)	(56,356)
Other	(1,136)	(918)	(1,299)
Net cash provided (used)	46,636	129,157	50,337
Net change in cash and cash equivalents	12,588	8,076	1,034
Cash and cash equivalents, beginning of year	14,073	5,997	4,963
Cash and cash equivalents, end of year	26,661	14,073	5,997
GSWC
Cash Flows From Operating Activities:
Net Income	94,463	102,708	53,770
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,738	36,623	35,072
Provision for doubtful accounts	1,310	754	1,018
Deferred income taxes and investment tax credits	2,748	2,949	855
Stock-based compensation expense	3,279	2,994	2,269
(Gain) loss on investments held in a trust	(5,293)	(5,008)	5,177
Other — net	240	106	9
Changes in assets and liabilities:
Accounts receivable — customers	(5,004)	(6,321)	6,263
Unbilled receivable	(2,232)	(2,179)	5,519
Other accounts receivable	877	(1,484)	931
Materials and supplies	(163)	(1,260)	(736)
Prepayments and other assets	595	1,838	2,125
Regulatory assets/liabilities	24,386	(74,378)	(12,704)
Accounts payable	4,617	(5,420)	7,671
Income taxes receivable/payable	(3,031)	1,470	(4,664)
Intercompany receivable/payable	260	248	(805)
Accrued pension and other post-retirement benefits	(315)	979	(3,228)
Other liabilities	4,134	(278)	(4,034)
Net cash provided (used)	158,609	54,341	94,508
Cash Flows From Investing Activities:
Capital expenditures	(197,355)	(160,939)	(146,730)
Other investing activities	(1,423)	(1,215)	(1,001)
Net cash provided (used)	(198,778)	(162,154)	(147,731)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	40,000	10,000	0
Receipt of advances for and contributions in aid of construction	11,195	11,889	6,901
Refunds on advances for construction	(4,919)	(4,540)	(5,321)
Repayments of long-term debt	(370)	(334)	(377)
Proceeds from the issuance of long-term debt, net of issuance costs	64,569	129,665	0
Net changes in notes payable to banks	(26,000)	149,198	0
Net changes in intercompany borrowings	0	(129,000)	80,000
Dividends paid	(35,100)	(55,400)	(27,000)
Other	(1,063)	(840)	(1,135)
Net cash provided (used)	48,312	110,638	53,068
Net change in cash and cash equivalents	8,143	2,825	(155)
Cash and cash equivalents, beginning of year	3,195	370	525
Cash and cash equivalents, end of year	$ 11,338	$ 3,195	$ 370