Wash. Rev. Code § 51.12.110
Any employer who has in his or her employment any person or persons excluded from mandatory coverage pursuant to RCW 51.12.020 may file notice in writing with the director, on such forms as the department may provide, of his or her election to make such persons otherwise excluded subject to this title. The employer shall forthwith display in a conspicuous manner about his or her works, and in a sufficient number of places to reasonably inform his or her workers of the fact, printed notices furnished by the department stating that he or she has so elected. Said election shall become effective upon the filing of said notice in writing. The employer and his or her workers shall be subject to all the provisions of this title and entitled to all of the benefits thereof: PROVIDED, That those who have heretofore complied with the foregoing conditions and are carried and considered by the department as within the purview of this title shall be deemed and considered as having fully complied with its terms and shall be continued by the department as entitled to all of the benefits and subject to all of the liabilities without other or further action. Any employer who has complied with this section may withdraw his or her acceptance of liability under this title by filing written notice with the director of the withdrawal of his or her acceptance. Such withdrawal shall become effective thirty days after the filing of such notice or on the date of the termination of the security for payment of compensation, whichever last occurs. The employer shall, at least thirty days before the effective date of the withdrawal, post reasonable notice of such withdrawal where the affected worker or workers work and shall otherwise notify personally the affected workers. Withdrawal of acceptance of this title shall not affect the liability of the department or self-insurer for compensation for any injury occurring during the period of acceptance.
The department shall have the power to cancel the elective adoption coverage if any required payments or reports have not been made. Cancellation by the department shall be no later than thirty days from the date of notice in writing by the department advising of cancellation being made.
RCW 51.12.110
Effective date-Conflict with federal requirements-1991 c 246: See notes following RCW 51.08.195.
Effective dates-Implementation-1982 c 63: See note following RCW 51.32.095.
Severability-Effective date-1977 ex.s. c 323: See notes following RCW 51.04.040.
Effective dates-Severability-1971 ex.s. c 289: See RCW 51.98.060 and 51.98.070.