Washington Revised Code Title 79. Public Lands § 79.44.003. “Assessing district” defined

(1) Incorporated cities and towns;

(2) Diking districts;

(3) Drainage districts;

(4) Port districts;

(5) Irrigation districts;

(6) Water-sewer districts;

(7) Counties;

(8) Weed boards and weed districts;  and

(9) Any municipal corporation or public agency having power to levy local improvement or other assessments, rates, or charges which by statute are expressly made applicable to lands of the state.