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Summary of Significant Accounting Policies (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) customer registrant | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 14, 2022 USD ($) | Feb. 02, 2022 USD ($) | Jan. 26, 2022 USD ($) | Jul. 12, 2021 USD ($)
Nature of Operations: |  |  |  |  |  |  |
Number of customers served | customer | 1,000,000 |  |  |  |  |  |
Number of States in which Entity Operates | 9 |  |  |  |  |  |
Number of registrants filing combined report | registrant | 2 |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 5,200,000 | $ 5,300,000 | $ 4,900,000 |  |  |  |
Impairment of Long-Lived Assets |  |  |  |  |  |  |
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 0 |  |  |  |  |  |
Impairment of long-lived assets | 0 | 0 | $ 0 |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill arose from acquisition of subcontractor's business | $ 1,100,000 | 1,100,000 |  |  |  |  |
Advances for Construction and Contributions in aid of Constructions |  |  |  |  |  |  |
Period for refund of advances for construction | 40 years |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | $ 424,151,000 |  |  |  |  |  |
Total | (25,454,000) | (22,796,000) |  |  |  |  |
Level 1 |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 0 |  |  |  |  |  |
Level 3 |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 0 |  |  |  |  |  |
Carrying Amount |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 450,373,000 |  |  |  |  |  |
Fair Value | Level 2 |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 424,151,000 |  |  |  |  |  |
GSWC |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Intercompany note payable | $ 129,000,000 | $ 49,280,000 |  |  |  |  |
Intercompany borrowings payment term | 24 months |  |  |  |  |  |
Property and Depreciation |  |  |  |  |  |  |
Aggregate composite rate for depreciation (as a percent) | 2.20% | 2.20% | 2.20% |  |  |  |
Depreciation | $ 37,300,000 | $ 35,500,000 | $ 32,900,000 |  |  |  |
Depreciation on transportation equipment | $ 382,000 | 379,000 | 353,000 |  |  |  |
Estimated useful lives of utility plant, as authorized by the CPUC |  |  |  |  |  |  |
Generation | 40 years |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | $ 391,198,000 |  |  |  |  |  |
Water Utility Relief Funding For Overdue Water Bills Per Budget Act Of 2021 |  |  |  |  |  |  | $ 1,000,000,000
Relief funding | 9,500,000 |  |  |  |  |  |
Total | (26,574,000) | (24,082,000) |  |  |  |  |
Regulatory Asset CEMA | 3,500,000 |  |  |  |  |  |
GSWC | COVID-19 memorandum account |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Total | 3,478,000 | 1,663,000 |  |  |  |  |
GSWC | Level 1 |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 0 |  |  |  |  |  |
GSWC | Level 3 |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 0 |  |  |  |  |  |
GSWC | Carrying Amount |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | 415,373,000 | 415,788,000 |  |  |  |  |
GSWC | Fair Value |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC |  | 490,852,000 |  |  |  |  |
GSWC | Fair Value | Level 2 |  |  |  |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Long-term debt-GSWC | $ 391,198,000 |  |  |  |  |  |
GSWC | Minimum |  |  |  |  |  |  |
Estimated useful lives of utility plant, as authorized by the CPUC |  |  |  |  |  |  |
Source of water supply | 30 years |  |  |  |  |  |
Pumping | 25 years |  |  |  |  |  |
Water treatment | 20 years |  |  |  |  |  |
Transmission and Distribution | 25 years |  |  |  |  |  |
Other plant | 7 years |  |  |  |  |  |
GSWC | Maximum |  |  |  |  |  |  |
Estimated useful lives of utility plant, as authorized by the CPUC |  |  |  |  |  |  |
Source of water supply | 50 years |  |  |  |  |  |
Pumping | 40 years |  |  |  |  |  |
Water treatment | 35 years |  |  |  |  |  |
Transmission and Distribution | 55 years |  |  |  |  |  |
Other plant | 40 years |  |  |  |  |  |
BVESI |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 2,700,000 | 2,800,000 | 1,300,000 |  |  |  |
Interest |  |  |  |  |  |  |
Public Utilities, Allowance for Funds Used During Construction, Additions | $ 106,000 | $ 216,000 | $ 200,000 |  |  |  |
Fair Value of Financial Instruments |  |  |  |  |  |  |
Relief funding |  |  |  | $ 152,000 | $ 321,000 | $ 9,500,000 |
Annual basis residential disconnections cap | 2.50% |  |  |  |  |  |
Regulatory Asset CEMA | $ 497,000 |  |  |  |  |  |
Water: | GSWC |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Number of customers served | customer | 263,000 |  |  |  |  |  |
Electric: | BVESI |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Number of customers served | customer | 24,700 |  |  |  |  |  |
Contracted services: | American States Utility Services |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases | 50 years |  |  |  |  |  |

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