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Fair Value of Financial Instruments | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | Fair Value of Financial Instruments For cash and cash equivalents, accounts receivable, accounts payable and short-term debt, the carrying amount is assumed to approximate fair value due to the short-term nature of these items. Investments held in a Rabbi Trust for the supplemental executive retirement plan (“SERP”) are measured at fair value and totale d $45.8 million as of September 30, 2025 and $41.2 million as of December 31, 2024. All equity investments in the Rabbi Trust are Level 1 investments in mutual funds. The investments held in the Rabbi Trust are included in “Other Property and Investments” on Registrant’s balance sheets. The table below estimates the fair value of long-term debt held by AWR and GSWC, respectively. As of September 30, 2025, the outstanding long-term debt of AWR includes $100.0 million from new debt issued by GSWC in May 2025 and $50.0 million from BVES in February 2025. The fair values as of September 30, 2025 and December 31, 2024 were determined using rates for similar financial instruments of the same duration utilizing Level 2 methods and assumptions. Changes in the assumptions will produce different results.
|  | September 30, 2025 |  | December 31, 2024
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—AWR (1) |  | $ | 794,310 |  |  | $ | 789,513 |  |  | $ | 643,893 |  |  | $ | 608,184 |
|  | September 30, 2025 |  | December 31, 2024
(dollars in thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial liabilities: |  |  |  |  |  |  |  |
Long-term debt—GSWC (2) |  | $ | 709,310 |  |  | $ | 702,043 |  |  | $ | 608,893 |  |  | $ | 575,749 |
__________________ (1) Excludes debt issuance costs of approximately $3.6 million and $3.1 million as of September 30, 2025 and December 31, 2024, respectively. (2) Excludes debt issuance costs of approximately $3.2 million and $3.0 million as of September 30, 2025 and December 31, 2024, respectively.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/825/tableOfContent + Details
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