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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]  
Public Utility Property, Plant, and Equipment
Estimated useful lives of regulated utilities’ utility plant, as authorized by the CPUC, are as follows:
Source of water supply
20 years to 60 years
Pumping
26 years to 41 years
Water treatment
26 years to 32 years
Transmission and distribution
15 years to 80 years
Generation40 years
Other plant
5 years to 62 years
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments Rates available to AWR and GSWC at December 31, 2025 and 2024 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results.
 20252024
(dollars in thousands)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt—AWR (1)(2)
$794,310 $790,820 $643,893 $608,184 
20252024
(dollars in thousands)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt—GSWC (1)(3)
$709,310 $703,319 $608,893 $575,749 
(1) Excludes debt issuance costs and redemption premiums.
(2) Includes $100.0 million of debt issued by GSWC in May 2025 and $50.0 million debt issued by BVES in February 2025.
(3) Includes $100.0 million of debt issued by GSWC in May 2025.
Fair Value, Liabilities Measured on Recurring Basis
The following table sets forth by level, within the fair value hierarchy, Registrant’s long-term debt measured at fair value as of December 31, 2025:
(dollars in thousands)Level 1Level 2Level 3Total
Long-term debt—AWR— $790,820 — $790,820 
(dollars in thousands)Level 1Level 2Level 3Total
Long-term debt—GSWC— $703,319 — $703,319