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Regulatory Matters 2 (Details) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2005	Jul. 31, 2005	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Regulatory matters:
Regulatory Asset Not Accruing Carrying Costs			$ 19,800,000
Under (over) collection			(16,539,000)	$ 2,450,000
Water			330,637,000	319,830,000	$ 295,258,000
Excess deferred income taxes
Regulatory matters:
Under (over) collection			78,300,000
Flow-through taxes, net
Regulatory matters:
Under (over) collection			10,400,000
WRAM
Regulatory matters:
Regulatory adjustment			5,900,000
Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Regulatory Asset Not Accruing Carrying Costs			66,600,000
GSWC
Regulatory matters:
Under (over) collection			(12,373,000)	2,450,000
Water			330,637,000	319,830,000	$ 295,258,000
GSWC | Excess deferred income taxes
Regulatory matters:
Under (over) collection			74,185,000	79,886,000
GSWC | Costs deferred for future recovery on Aerojet case
Regulatory matters:
Under (over) collection			(6,751,000)	(8,292,000)
Recovery period		20 years
Increase in Revenue Requirement, Recoverable through Surcharges		$ 21,300,000
Deferred Costs, Noncurrent			17,500,000
GSWC | Costs deferred for future recovery on Aerojet case | Maximum
Regulatory matters:
Recovery period	20 years
GSWC | Gain (Loss) on Derivative Instruments [Member]
Regulatory matters:
Under (over) collection			0	(3,171,000)
GSWC | Flow-through taxes, net
Regulatory matters:
Under (over) collection			$ 9,722,000	12,439,000
GSWC | WRAM, net of MCBA
Regulatory matters:
Commercial paper, term			90 days
Amount billed to customers as surcharges			$ 14,700,000
Under (over) collection			$ (13,741,000)	(22,535,000)
GSWC | WRAM, net of MCBA | Maximum
Regulatory matters:
Recovery period			24 months
GSWC | WRAM
Regulatory matters:
Under (over) collection			$ 3,600,000
Deferred Revenues			0
GSWC | Modified Cost Balancing Account
Regulatory matters:
Under (over) collection			(17,300,000)
GSWC | Pension Costs and Other Postretirement Benefit Costs
Regulatory matters:
Under (over) collection			(65,576,000)	(40,693,000)
Regulatory Assets			66,600,000
Various refunds to customers | GSWC
Regulatory matters:
Under (over) collection			$ 4,577,000	$ 8,478,000

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- Definition

Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs.

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Represents the regulatory asset not accruing carrying costs as of the balance sheet date.

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- Definition

Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

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The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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