LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Schedule of long-term debt outstanding

As of December 31, 2025 and 2024, long-term debt outstanding was:

	Series	Interest Rate	Maturity	2025		2024
California Water Service Group Senior Notes (a)	A	4.87%	2032	$	70,000	$	—
	B	5.22%	2035	100,000		—
Total Senior Notes				170,000		—
First Mortgage Bonds	1	3.02%	2061	150,000		150,000
	2	5.22%	2054	125,000		125,000
	3	5.64%	2055	200,000		—
	AAA	7.28%	2025	—		20,000
	BBB	6.77%	2028	20,000		20,000
	CCC	8.15%	2030	20,000		20,000
	DDD	7.13%	2031	20,000		20,000
	EEE	7.11%	2032	20,000		20,000
	OOO	6.02%	2031	20,000		20,000
	PPP	5.50%	2040	100,000		100,000
	QQQ	3.33%	2025	—		50,000
	RRR	4.31%	2045	50,000		50,000
	SSS	4.41%	2046	40,000		40,000
	TTT	4.61%	2056	10,000		10,000
	VVV	3.40%	2029	100,000		100,000
	WWW	4.07%	2049	100,000		100,000
	YYY	4.17%	2059	200,000		200,000
	ZZZ	2.87%	2051	130,000		130,000
Total First Mortgage Bonds				1,305,000		1,175,000
California Department of Water Resources Loans		1.30% - 1.69%	2027 - 2039	3,546		3,872
Other long-term debt				2,031		2,933
Unamortized debt issuance costs				(6,339)		(4,812)
Total long-term debt, net of unamortized debt issuance costs				1,474,238		1,176,993
Less current maturities of long-term debt, net				2,270		72,422
Long-term debt, net				$	1,471,968	$	1,104,571

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(a)     Senior notes held by institutional investors are unsecured obligations.

Schedule of maturities of long-term debt

Maturities of long-term debt as of December 31, 2025 are as follows:

Year Ending December 31,	Long-term debt*
2026	$	357
2027	333
2028	20,318
2029	100,297
2030	20,236
Thereafter	1,337,124

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*    Excludes maturities for finance lease obligations. See Note 15 of the Notes to Consolidated Financial Statements for maturities for finance lease obligations.