Wash. Rev. Code § 90.46.220
(1) Any person proposing to generate any type of reclaimed water for a use regulated under this chapter shall obtain a permit from the lead agency prior to distribution or use of that water. The permittee may then distribute and use the water, subject to the provisions in the permit. The permit must include provisions that protect human health and the environment. At a minimum, the permit must:
(2) A permit under this chapter may be issued only to:
[ 2009 c 456 s 9.]