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Benefit Plans
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
SJW 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. 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 other than pension plans.
The components of net periodic benefit costs for the defined benefit plans and other postretirement benefits for the three and six months ended June 30, 2021, and 2020 are as follows:
 Three months ended June 30,Six months ended June 30,
 2021202020212020
Service cost$2,688 2,337 $5,423 4,780 
Interest cost2,530 2,816 5,110 5,720 
Expected return on assets(4,742)(4,183)(9,494)(8,303)
Unrecognized actuarial loss1,794 1,834 3,574 2,592 
Amortization of prior service cost13 (665)25 76 
Total$2,283 2,139 $4,638 4,865 
In 2021, SJW Group expects to make required and discretionary cash contributions of up to $9,043 to the pension plans and other postretirement benefits. For the three and six months ended June 30, 2021, SJW Group has made $1,480 contributions to such plans.