Wash. Rev. Code § 87.68.040
The officers of said district shall cause said assessments to be made, levied and equalized and the assessment roll and any parts thereof to be delivered to the proper county treasurers on or before December 10th of said year and upon receipt of a certified copy of said resolution adopting December 31st as the day on or before which assessments shall be paid, the county officers charged with the collection of irrigation district assessments shall be authorized and it shall be their duty respectively to collect the same in accordance with the provisions of RCW 87.68.010 through 87.68.050 and of said resolution and to account for collections in the manner provided by the irrigation district law.
RCW 87.68.040
Severability-Construction-1941 c 141: See notes following RCW 87.68.010.
Assessments and levies: RCW 87.03.240 through 87.03.305.
Claims, how paid, etc.: RCW 87.03.440.