Wash. Rev. Code § 89.08.210
The supervisors may employ a secretary, treasurer, technical experts, and such other officers, agents, and employees, permanent and temporary, as they may require, and determine their qualifications, duties, and compensation. It may call upon the attorney general for legal services, or may employ its own counsel and legal staff. The supervisors may delegate to their chair, to one or more supervisors, or to one or more agents or employees such powers and duties as it deems proper. The supervisors shall furnish to the commission, upon request, copies of such internal rules, regulations, orders, contracts, forms, and other documents as they shall adopt or employ, and such other information concerning their activities as the commission may require in the performance of its duties under chapter 184, Laws of 1973 1st ex. sess. The supervisors shall provide for the execution of surety bonds for officers and all employees who shall be entrusted with funds or property.
The supervisors shall provide for the keeping of a full and accurate record of all proceedings, resolutions, regulations, and orders issued or adopted. The supervisors shall provide for an annual audit of the accounts of receipts and disbursements in accordance with procedures prescribed by regulations of the commission.
The board may invite the legislative body of any municipality or county near or within the district, to designate a representative to advise and consult with it on all questions of program and policy which may affect the property, water supply, or other interests of such municipality or county. The governing body of a district shall appoint such advisory committees as may be needed to assure the availability of appropriate channels of communication to the board of supervisors, to persons affected by district operations, and to local, regional, state and interstate special-purpose districts and agencies responsible for community planning, zoning, or other resource development activities. The district shall keep such committees informed of its work, and such advisory committees shall submit recommendations from time to time to the board of supervisors.
RCW 89.08.210