Washington Revised Code Title 4. Civil Procedure § 4.96.010. Tortious conduct of local governmental entities--Liability for damages

(1) All local governmental entities, whether acting in a governmental or proprietary capacity, shall be liable for damages arising out of their tortious conduct, or the tortious conduct of their past or present officers, employees, or volunteers while performing or in good faith purporting to perform their official duties, to the same extent as if they were a private person or corporation. Filing a claim for damages within the time allowed by law shall be a condition precedent to the commencement of any action claiming damages. The laws specifying the content for such claims shall be liberally construed so that substantial compliance therewith will be deemed satisfactory.

(2) Unless the context clearly requires otherwise, for the purposes of this chapter, “local governmental entity” means a county, city, town, special district, municipal corporation as defined in RCW 39.50.010, quasi-municipal corporation, any joint municipal utility services authority, any entity created by public agencies under RCW 39.34.030, or public hospital.

(3) For the purposes of this chapter, “volunteer” is defined according to RCW 51.12.035.