Washington Revised Code Title 70A. Environmental Health and Safety § 70A.105.020. Definitions

(1) “Nonwater-carried sewage disposal devices” means any device that stores and treats nonwater-carried human urine and feces.

(2) “Alternative methods of effluent disposal” means systems approved by the department of health, including at least, mound systems, alternating drainfields, anaerobic filters, evapotranspiration systems, and aerobic systems.

(3) “Failure” means: (a) Effluent has been discharged on the surface of the ground prior to approved treatment; or (b) effluent has percolated to the surface of the ground; or (c) effluent has contaminated or threatens to contaminate a groundwater supply.

(4) “Additive” means any commercial product intended to affect the performance or aesthetics of an on-site sewage disposal system.

(5) “Department” means the department of health.

(6) “On-site sewage disposal system” means any system of piping, treatment devices, or other facilities that convey, store, treat, or dispose of sewage on the property where it originates or on nearby property under the control of the user where the system is not connected to a public sewer system. For purposes of this chapter, an on-site sewage disposal system does not include indoor plumbing and associated fixtures.

(7) “Chemical additive” means those additives containing acids, bases, or other chemicals deemed unsafe by the department for use in an on-site sewage disposal system.

(8) “Additive manufacturer” means any person who manufactures, formulates, blends, packages, or repackages an additive product for sale, use, or distribution within the state.