Any person, except the state of Washington and the United States, acting under the provisions of this chapter, to whom or to which a contract may have been awarded by the district for construction purposes, or for labor or materials entering therein when the total amount to be paid therefor exceeds one thousand dollars, shall enter into a bond to the state of Washington, with good and sufficient sureties, to be approved and filed with the state director, for one hundred percent of the contract price, conditioned for the faithful performance of said contract and with such further conditions as may be required by law.
RCW 86.09.181
Contractor's bond: Chapter 39.08 RCW.