There is created in the county treasurer's office of the county in which the board of joint control was created, a special fund to be designated Control Fund of the (naming the county) County Joint Control Board No. (specifying the number). The county treasurer shall distribute all collections for this fund to the control fund. The treasurer of any other county collecting assessments for this fund shall remit the assessments monthly to the county treasurer of the county in which the board of joint control was created. However, at the option of the board of joint control, a treasurer other than the county treasurer may be designated under RCW 87.03.440.