1. (1) This chapter applies to all prefabricated tanks and all cast-in-place tanks. This chapter establishes sewage tank design and construction requirements, plan review and approval requirements, and prefabricated tank registration requirements.

2. (2) This chapter contains specific requirements for:

   1. (a) Manufacturers of prefabricated tanks and builders of cast-in-place tanks;
   2. (b) Persons designing sewage tanks;
   3. (c) The department for reviewing, registering, and approving sewage tank design and construction plans;
   4. (d) Persons installing sewage tanks; and
   5. (e) The local health officer and the department for approving on-site sewage system designs, plans, specifications, and installations under chapters 246-272A and 246-272B WAC.
3. (3) This chapter does not contain all requirements for on-site sewage systems. Additional requirements for on-site sewage systems, including maintenance requirements, are found in chapters 246-272A and 246-272B WAC.

4. (4) This chapter does not apply to:

   1. (a) Facilities regulated by the department of ecology;
   2. (b) Reclaimed water systems as described in chapter 90.46 RCW;
   3. (c) Tanks used to store municipal sewage sludge regulated as biosolids under chapter 173-308 WAC; or
   4. (d) Geomembrane containment vessels for public domain treatment technologies. An example of this excluded technology is PVC containment vessels for public domain packed bed filters.

[Statutory Authority: RCW 43.20.050 (2) and (3). WSR 09-23-119, § 246-272C-0010, filed 11/18/09, effective 12/19/09.]