This chapter shall apply with respect to employment performed in any workplace within the state. The department of labor and industries shall provide by rule for a schedule of fees and charges to be paid by each employer subject to this chapter who is not subject to or obtaining coverage under the industrial insurance laws and who is not a self-insurer. The fees and charges collected shall be for the purpose of defraying such employer's pro rata share of the expenses of enforcing and administering this chapter.
RCW 49.17.030