- (1) The department shall review and approve all sewage tank design and construction plans.
- (2) Prefabricated tank models and sizes built from approved design and construction plans must be registered with the department.
- (3) Cast-in-place tanks are project specific and must be constructed using a design and construction plan approved by the department.
- (4) Designers and design engineers shall specify only prefabricated tanks registered with the department or a cast-in-place tank approved by the department in their on-site sewage system designs, plans, and specifications.
- (5) Installers shall install only prefabricated tanks registered with the department or construct only cast-in-place tanks that the department has reviewed and approved.
- (6) A manufacturer or agent shall sell only prefabricated tanks registered with the department in Washington.
- (7) Local health officers and the department shall approve only on-site sewage system designs and installations specifying either a prefabricated tank registered with the department or a cast-in-place tank approved by the department.
[Statutory Authority: RCW 43.20.050 (2) and (3). WSR 09-23-119, § 246-272C-0110, filed 11/18/09, effective 12/19/09.]