Wash. Rev. Code § 7.48.160 : — SPECIAL PROCEEDINGS AND ACTIONSNUISANCES — Authorized act not a nuisance

Nothing which is done or maintained under the express authority of a statute, can be deemed a nuisance.

RCW 7.48.160

Code 1881 § 1238; 1875 p 79 § 4; RRS § 9916.