(1) Greywater reuse must comply with all applicable local ordinances and codes, and state statutes and regulations including, but not limited to, the Uniform Plumbing Code, as adopted in chapters 51-56 and 51-57 WAC.

(2) For buildings using an on-site sewage system, the use of a greywater irrigation system does not change the design, capacity, or reserve area requirements, or any other requirement applicable to on-site sewage systems under RCW 43.20.050, chapters 70.118B RCW, or 246-272A, 246-272B, or 246-272C WAC.

(3) The use of a greywater irrigation system does not serve as an alternative to the use of an approved on-site sewage system or connection to an approved public sewer for greywater disposal at any building, including buildings using waterless toilets.