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Subsequent Event	9 Months Ended
	Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Event	Subsequent Events Long-term debt issuance for CWC On October 28, 2025, CWC entered into a note purchase agreement with certain institutional investors, pursuant to which the company agreed to sell an aggregate principal amount of $60,000 of its 6.08% Senior Notes, Series 2025 (“Series 2025 Notes”). The Series 2025 Notes are unsecured obligations of CWC and are due on November 1, 2055. Interest is payable semi-annually in arrears on May 1st and November 1st of each year, commencing May 1, 2026. PFAS litigation settlement In October of 2025, the Company received cash proceeds of $3,762, in connection with a legal settlement with DuPont de Nemours, Inc. related to PFAS contamination. The total proceeds were allocated as follows: SJWC received $2,542; CWC received $1,153; and MWC received $67 which includes $52 payable to contract operators.

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- References

No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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