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Revenues (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue For the three and nine months ended September 30, 2025 and 2024, disaggregated revenues from contracts with customers by segment were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(dollars in thousands)2025202420252024
Water:
Tariff-based revenues$130,229 $119,716 $347,800 $300,442 
CPUC-approved surcharges (cost-recovery activities)2,052 946 4,613 2,405 
Other680 694 1,980 1,944 
     Water revenues from contracts with customers132,961 121,356 354,393 304,791 
M-WRAM/WRAM under/(over)-collection (alternative revenue programs) (1)(638)2,687 (370)19,941 
    Total water revenues 132,323 124,043 354,023 324,732 
Electric:
Tariff-based revenues11,823 8,892 37,336 30,431 
CPUC-approved surcharges (cost-recovery activities)1,161 27 2,588 130 
     Electric revenues from contracts with customers12,984 8,919 39,924 30,561 
BRRAM under/(over)-collection (alternative revenue program)348 121 1,338 (613)
     Total electric revenues 13,332 9,040 41,262 29,948 
Contracted services:
Water 20,992 14,651 52,002 57,821 
Wastewater16,069 14,048 46,508 39,860 
 Contracted services revenues from contracts with customers
37,061 28,699 98,510 97,681 
     Total AWR revenues$182,716 $161,782 $493,795 $452,361 
(1) On January 30, 2025, the CPUC issued a final decision in connection with GSWC’s general rate case (“GRC”) that adopted a settlement agreement between GSWC and Cal Advocates and set new rates for 2025 – 2027, with rates retroactive to January 1, 2025. The final decision rejected GSWC’s request for the continuation of the WRAM, and instead orders GSWC to transition to a modified rate adjustment mechanism (a Monterey-style WRAM or “M-WRAM”). The M-WRAM tracks the difference between the revenue based on actual metered sales through a tiered volumetric rate and the revenue that would have been received with the same actual metered sales if a standard quantity rate had been in effect. During the three and nine months ended September 30, 2025, the balances recorded in the new M-WRAM were not material.
Contract with Customer, Asset and Liability
The opening and closing balances of the receivable from the U.S. government, contract assets, and contract liabilities from contracts with customers, which are related entirely to ASUS, are as follows:    
(dollars in thousands)September 30, 2025December 31, 2024
Unbilled receivables$5,438 $10,910 
Receivable from the U.S. government$66,485 $76,486 
Contract assets$27,572 $21,648 
Contract liabilities$10,420 $5,662