Wash. Rev. Code § 35A.21.390
(1) A city with an ordinance or resolution requiring, upon the failure of an on-site septic system, connection to a public sewer system must, in accordance with this section, provide an administrative appeals process to consider denials of permit applications to repair or replace the septic system. The administrative appeals process required by this section applies only to requests to repair or replace existing, failing on-site septic systems that:
(3) The administrative appeals process required by this section must, at a minimum, consider whether:
[ 2015 c 297 s 2.]