Wash. Rev. Code § 70.114A.060
The secretary of the department or authorized representative may inspect housing covered by chapter 220, Laws of 1995, to enforce temporary worker housing rules adopted by the state board of health prior to July 25, 1999, or the department, or when the secretary or representative has reasonable cause to believe that a violation of temporary worker housing rules adopted by the state board of health prior to July 25, 1999, or the department is occurring or is being maintained. If the buildings or premises are occupied as a residence, a reasonable effort shall be made to obtain permission from the resident. If the premises or building is unoccupied, a reasonable effort shall be made to locate the owner or other person having charge or control of the building or premises and request entry. If consent for entry is not obtained, for whatever reason, the secretary or representative shall have recourse to every remedy provided by law to secure entry.
RCW 70.114A.060