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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Line Items]

Public Utility Property, Plant, and Equipment [Table Text Block]

Estimated useful lives of GSWC’s utility plant, as authorized by the CPUC, are as follows:

Source of water supply	30 years to 50 years
Pumping	25 years to 40 years
Water treatment	20 years to 35 years
Transmission and distribution	25 years to 55 years
Generation	40 years
Other plant	7 years to 40 years

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

The table below estimates the fair value of long-term debt issued by GSWC. Rates available to GSWC at December 31, 2019 and 2018 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.

		2019								2018
(dollars in thousands)		Carrying Amount				Fair Value				Carrying Amount				Fair Value
Long-term debt—GSWC (1)		$	284,699			$	376,467			$	324,978			$	387,889

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

The following table sets forth by level, within the fair value hierarchy, GSWC’s long-term debt measured at fair value as of December 31, 2019:

(dollars in thousands)		Level 1			Level 2				Level 3			Total
Long-term debt—GSWC		—			$	376,467			—			$	376,467

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Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation.

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