Wash. Rev. Code § 70A.115.040
(2) In adopting the rules, the secretary shall, in consultation with the department of ecology, require that large on-site sewage systems comply with the applicable sections of chapter 90.48 RCW regarding control and prevention of pollution of waters of the state, including but not limited to:
[ 2007 c 343 s 5. Formerly RCW 70.118B.040.]