All questions concerning eligibility, plan coverage and rates should be directed to the Contra Costa County Benefits Office at. To retire you must meet two requirements: age and service credit .Your minimum retirement age depends on your retirement formula: 50, 52, or 55 . The California Public Employees' Pension Reform Act of 2013 (PEPRA) took effect January 1, 2013. The Contra Costa Water District (CCWD) is pleased to present you with our Retirement Handbook. Your retirement is an important event. Review the Retirement Plan Joinder – Information Sheet (FL-318-INFO) to see if you need to join the plan. 2. The County Employees Retirement Act of 1937 provided for retirement systems for California counties. Pursuant to Government Code Section 31874, the provisions of Sections 31870 ff. Plan Trust Agreement for Confidential Employees.