WAC 246-360-050
WAC 246-360-050. Sewage and liquid waste disposal
The licensee must provide documentation that demonstrates that sewage and liquid waste drain into:
(1) A municipal sewage system if available; or
(2) A sewage disposal system designed, constructed, and maintained in accordance with chapters 246-272 , 246-272B, and 173-240 WAC and local ordinances.