Equity Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

A summary of compensation costs charged to income and proceeds from share-based compensation, which are recorded to additional paid-in capital and common stock, by award type, are presented below for the years ended December 31:

	2023		2022	2021
Compensation costs charged to income:
ESPP	$	378	369	357
Restricted stock and deferred restricted stock	4,269		4,422	3,889
Total compensation costs charged to income	$	4,647	4,791	4,246
ESPP proceeds	$	2,141	2,091	2,026

Schedule of Restricted and Deferred Restricted Stock Awards

A summary of SJW Group’s outstanding restricted and deferred restricted stock awards under the Plan as of December 31, 2023, and changes during the year ended December 31, 2023, are presented below:

	Units	Weighted- Average Grant- Date Fair Value
Outstanding as of January 1, 2023	162,502	$	63.77
Granted	69,655	$	78.30
Issued	(66,977)	$	57.05
Forfeited	(14,476)	$	72.43
Outstanding as of December 31, 2023	150,704	$	72.64
Shares vested as of December 31, 2023	27,159	$	66.81

Schedule of Nonvested Restricted Stock Units Activity

A summary of the status of SJW Group’s nonvested restricted and deferred restricted stock awards under the plans as of December 31, 2023, and changes during the year ended December 31, 2023, are presented below:

	Units	Weighted-  Average Grant- Date Fair Value
Nonvested as of January 1, 2023	125,459	$	66.71
Granted	69,655	$	78.30
Vested	(63,755)	$	64.62
Forfeited	(7,814)	$	72.98
Nonvested as of December 31, 2023	123,545	$	73.93