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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Schedule of Allocation of Plan Assets

The following tables summarize the fair values of the Rabbi Trust investment assets to fund CTWS’s SERP by major categories as of December 31, 2022 and 2021 :

												Fair Value Measurements at December 31, 2022
Asset Category						Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Money market funds						$	49					49						—						—
Mutual funds						2,032						2,032						—						—
Fixed income						728						728						—						—
Total						$	2,809					2,809						—						—

												Fair Value Measurements at December 31, 2021
Asset Category						Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Money market funds						$	186					186						—						—
Mutual funds						2,691						2,691						—						—
Fixed income						920						920						—						—
Total						$	3,797					3,797						—						—

Plan assets as of December 31 were as follows:

			Pension Benefits												Other Benefits
			2022						2021						2022						2021
Fair value of assets at end of year:
Debt securities			$	90,914					100,036						$	5,330					5,541
			36		%				32		%				30		%				25		%
Equity securities			147,864						197,248						11,711						14,932
			59		%				64		%				65		%				69		%
Cash and equivalents			13,182						12,892						911						1,294
			5		%				4		%				5		%				6		%
Total			$	251,960					310,176						$	17,952					21,767

The following tables summarize the fair values of plan assets by major categories as of December 31, 2022 and 2021:

									Fair Value Measurements at December 31, 2022
Asset Category			Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Cash and cash equivalents			$	14,093					14,093						—						—
Equity securities (a)			159,575						159,575						—						—
Fixed Income (b)			96,244						30,863						65,381						—
Total			$	269,912					204,531						65,381						—

___________________________________

(a)Actively managed portfolio of equity securities with the goal to exceed the benchmark performance.

(b)Actively managed portfolio of fixed income securities with the goal to exceed the benchmark performance

									Fair Value Measurements at December 31, 2021
Asset Category			Total						Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Cash and cash equivalents			$	14,186					14,186						—						—
Equity securities			212,180						212,180						—						—
Fixed Income			105,577						38,608						66,969						—
Total			$	331,943					264,974						66,969						—

Schedule of Assumptions Used

Net periodic cost for the defined benefit plans and other postretirement benefits was calculated using the following weighted-average assumptions:

			Pension Benefits																		Other Benefits
			2022						2021						2020						2022						2021						2020
			%						%						%						%						%						%
Discount rate			2.65 - 2.82						2.29 - 2.48						3.05 - 3.23						2.61 - 2.76						2.18 - 2.41						2.59 - 3.18
Expected return on plan assets			6.50, 6.75						6.50, 6.75						6.50, 6.75						4.20, 6.00						4.20, 6.50						4.20, 6.50
Rate of compensation increase			4.00, 4.50						4.00						4.00						N/A						N/A						N/A

Benefit obligations for the defined benefit plans and other postretirement benefits were calculated using the following weighted-average assumptions as of December 31:

			Pension Benefits												Other Benefits
			2022						2021						2022						2021
			%						%						%						%
Discount rate			4.95 - 5.24						2.65 - 2.82						4.96 - 5.21						2.61 - 2.76
Rate of compensation increase			4.50, 5.00						4.00						N/A						N/A

Schedule of Net Benefit Costs

Net periodic costs for the defined benefit plans and other postretirement benefits for the years ended December 31 was as follows:

			Pension Benefits																		Other Benefits
			2022						2021						2020						2022						2021						2020
Components of net periodic benefit cost
Service cost			$	9,359					9,730						8,659						$	1,032					1,115						900
Interest cost			10,708						9,415						10,484						883						806						956
Expected return on assets			(18,841)						(18,019)						(15,715)						(1,047)						(970)						(857)
Amortization of prior service cost			17						41						41						—						—						97
Recognized actuarial loss/(gain)			4,620						6,901						4,971						(115)						257						229
Recognition of significant event			(1,595)						—						—						—						—						—
Net periodic benefit cost			$	4,268					8,068						8,440						$	753					1,208						1,325

Schedule of Net Funded Status

The projected benefit obligations and the funded status of the defined benefit pension and other postretirement plans as of December 31 were as follows:

			Pension Benefits												Other Benefits
			2022						2021						2022						2021
Change in benefit obligation
Benefit obligation at beginning of year			$	383,838					386,091						$	34,412					35,794
Service cost			9,359						9,730						1,032						1,115
Interest cost			10,708						9,415						883						806
Actuarial (gain)/loss			(94,793)						(5,477)						(9,360)						(2,235)
Implicit rate subsidy			—						—						(236)						(222)
Plan participants contributions			—						—						207						171
Administrative expenses paid			(136)						(144)						—						—
Benefits paid and settlements			(19,853)						(15,777)						(1,108)						(1,017)
Benefit obligation at end of year			$	289,123					383,838						$	25,830					34,412
Change in plan assets
Fair value of assets at beginning of year			$	310,176					278,124						$	21,767					19,479
Actual return on plan assets			(49,939)						34,826						(3,606)						2,460
Employer contributions			11,712						13,147						626						669
Plan participants contributions			—						—						207						171
Administrative expenses paid			(136)						(144)						(65)						(63)
Benefits paid and settlements			(19,853)						(15,777)						(977)						(949)
Fair value of plan assets at end of year			251,960						310,176						17,952						21,767
Funded status at end of year			$	(37,163)					(73,662)						$	(7,878)					(12,645)

Schedule of Amounts Recognized in Balance Sheet

The amounts recognized on the balance sheet as of December 31 were as follows:

			Pension Benefits												Other Benefits
			2022						2021						2022						2021
Noncurrent assets			$	16,005					6,422						$	679					—
Current liabilities			(2,089)						(2,782)						(139)						(139)
Noncurrent liabilities			(51,079)						(77,302)						(8,418)						(12,506)
			$	(37,163)					(73,662)						$	(7,878)					(12,645)

Schedule of Regulatory Asset Recorded on the Projected Benefit Obligation of the Postretirement Benefit Plans

SJW Group recorded a regulatory asset on the projected benefit obligation of the postretirement benefit plans as follows:

			2022						2021
Funded status of obligation			$	45,041					86,307
Accrued benefit cost			(13,548)						(24,110)
Regulatory asset, amount to be recovered in future rates			$	31,493					62,197

Schedule of Expected Benefit Payments

Benefits expected to be paid in the next five years and in the aggregate for the five years thereafter are:

			Pension Plan						Other Postretirement Benefit Plan
2023			$	15,656					$	1,612
2024			16,535						1,839
2025			16,867						1,869
2026			21,301						1,886
2027			18,722						1,898
2028 - 2032			97,964						9,215

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