Cal. Pub. Util. Code § 105154

Employees of the district organized pursuant to Part 3 (commencing with Section 27000) of Division 16 of the Streets and Highways Code who transfer to the district and into a collective bargaining unit set forth in Section 105151, shall be credited with any accrued seniority earned at the district from which they have transferred, and shall not suffer a loss in their rate of wages, pension benefits, pension accrual rights, health benefits, retiree health benefits, vacation accrual, or other seniority-based benefits, such as job bidding and transfer rights, as a result of their transfer to the district.