Cal. Public Utilities Code § 105155

To facilitate implementation of the employee rights enumerated in this section, the district and the district organized pursuant to Part 3 (commencing with Section 27000) of Division 16 of the Streets and Highways Code may engage in joint collective bargaining with the accredited representatives of the collective bargaining units set forth in Section 105151 and the same or similar collective bargaining units within the district organized pursuant to Part 3 (commencing with Section 27000) of Division 16 of the Streets and Highways Code to establish uniform wages, health benefits, pension benefits, and other uniform terms and conditions of employment. To maintain continuity of pension benefits, the district shall have the right to appoint at least one representative to any joint labor-management retirement board that administers a retirement plan in which employees of the district and employees of the district organized pursuant to Part 3 (commencing with Section 27000) of Division 16 of the Streets and Highways Code are participants, provided that an equal number of employer and employee representatives on the retirement board is maintained. In addition, the district shall enter into a reciprocity agreement through the Public Employees’ Retirement System (PERS) which recognizes PERS service with the district organized pursuant to Part 3 (commencing with Section 27000) of Division 16 of the Streets and Highways Code of any district employee employed in a collective bargaining unit set forth in Section 105151 whose members’ pensions are provided through PERS.