Washington Revised Code Title 44. State Government--Legislative § 44.90.054. Collective bargaining agreements--Grievance procedure--Applicability of RCW 41.56.037--Effective dates--Certain payroll deductions prohibited

(4)(a) If a collective bargaining agreement between an employer and an exclusive bargaining representative is concluded after the termination date of the previous collective bargaining agreement between the employer and an employee organization representing the same bargaining units, the effective date of the collective bargaining agreement may be the day after the termination of the previous collective bargaining agreement, and all benefits included in the new collective bargaining agreement, including wage or salary increases, may accrue beginning with that effective date.

(b) If a collective bargaining agreement between an employer and an exclusive bargaining representative is concluded after the termination date of the previous collective bargaining agreement between the employer and the exclusive bargaining representative representing different bargaining units, the effective date of the collective bargaining agreement may be the day after the termination date of whichever previous collective bargaining agreement covering one or more of the units terminated first, and all benefits included in the new collective bargaining agreement, including wage or salary increases, may accrue beginning with that effective date.