Wash. Rev. Code § 39.106.040
(1) For the purpose of performing or providing utility services, and subject to subsection (3) of this section and RCW 39.106.050, an authority has and is entitled to exercise the following powers:
(3) In the exercise of its powers in connection with performing or providing utility services, an authority is subject to the following:
[ 2011 c 258 s 4.]