2005 Washington Revised Code RCW 47.64.160: Union security provisions.

A collective bargaining agreement may include union security provisions including an agency shop, but not a union or closed shop. If an agency shop provision is agreed to, the employer shall enforce it by deducting from the salary payments to members of the bargaining unit the dues required of membership in the bargaining representative, or, for nonmembers thereof, a fee equivalent to such dues. All union security provisions shall safeguard the right of nonassociation of employees based on bona fide religious tenets or teachings of a church or religious body of which such employee is a member. Such employee shall pay an amount of money equivalent to regular dues and fees to a nonreligious charity or to another charitable organization mutually agreed upon by the employee affected and the bargaining representative to which such employee would otherwise pay the dues and fees. The employee shall furnish written proof that such payment has been made. If the employee and the bargaining representative do not reach agreement on such matter, the commission shall designate the charitable organization.

[1983 c 15 § 7.]