Wash. Rev. Code § 10.85.030
The legislative authority of any county in the state, a port commission, or the governing body of a city or town, when in its opinion the public good requires it, is hereby authorized to offer and pay a suitable reward to any person or persons for information leading to:
In the event of crimes against county, port district, city, or town property, including but not limited to road signs, vehicles, buildings, or any other type of county, port district, city, or town property, the legislative authority of any county, a port commission, or the governing body of a city or town may offer and pay a suitable reward to any person or persons who shall furnish information leading to the arrest and conviction of any person of any offense against this county, port district, city, or town property, including but not limited to those offenses set forth in RCW 9A.48.070 through 9A.48.090, whether or not the offense is a felony, gross misdemeanor, or misdemeanor.
RCW 10.85.030