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Benefit Plans
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Benefit Plans Benefit PlansSJW Group maintains noncontributory defined benefit pension plans for its eligible employees. SJWC and CTWS employees hired before March 31, 2008, and January 1, 2009, respectively, are entitled to benefits under the pension plans based on the employee’s years of service and compensation. For SJWC employees hired on or after March 31, 2008, benefits are determined using a cash balance formula based upon compensation credits and interest credits for each employee. Starting in 2023, Texas Water employees are also eligible to participate under SJWC’s cash balance plan. Certain CTWS employees hired before March 1, 2012, and covered by a plan merged into the CTWS plan in 2013 are also entitled to benefits based on the employee’s years of service and compensation. CTWS employees hired on or after January 1, 2009, are entitled to an additional 1.5% of eligible compensation to their company sponsored savings plan. SJW Group does not have multi-employer plans.
In addition, senior management hired before March 31, 2008 for SJWC and January 1, 2009 for CTWS, are eligible to receive additional retirement benefits under supplemental executive retirement plans and retirement contracts. SJWC’s senior management hired on or after March 31, 2008, are eligible to receive additional retirement benefits under SJWC’s Cash Balance Executive Supplemental Retirement Plan. The supplemental retirement plans and Cash Balance Executive Supplemental Retirement Plan are non-qualified plans in which only senior management and other designated members of management may participate. SJW Group also provides health care and life insurance benefits for retired employees under employer-sponsored postretirement benefits that are not pension plans.
The components of net periodic benefit costs for the defined benefit plans and other postretirement benefits for the three months ended March 31, 2023, and 2022 are as follows:
 Three months ended March 31,
 20232022
Service cost$2,052 2,652 
Interest cost3,874 2,860 
Expected return on assets(4,286)(5,043)
Unrecognized actuarial loss466 1,164 
Amortization of prior service cost4 4 
Total$2,110 1,637 
In 2023, SJW Group expects to make required and discretionary cash contributions of up to $8,120 to the pension plans and other postretirement benefits. For the three months ended March 31, 2023, SJW Group has made no contributions to such plans.