1. (a) “Backwash water” means the water and solids contained therein which is generated by the process of reversing the flow of water back through the filter media to remove entrapped solids.
2. (b) “Conventional filtration” means “conventional filtration treatment” as defined in 40 CFR § 141.2, reprinted in Appendix B.
3. (c) “Cryptosporidium” means a microorganism found in raw water that can cause illness in humans and domestic animals after ingestion.
4. (d) “Direct filtration” means “direct filtration” as defined in 40 CFR § 141.2, reprinted in Appendix B.
5. (e) “Flocculation” means “flocculation” as defined in 40 CFR § 141.2, reprinted in Appendix B.
6. (f) “Giardia lamblia” means a microorganism found in raw water that can colonize and reproduce in the small intestine, causing giardiasis.
7. (g) “Legionella” means “legionella” as defined 40 CFR 141.2, reprinted in Appendix B.
8. (h) “PWS subject to this part” means a public water system that is in one of the categories listed in Env-Dw 716.02.
9. (i) “Sedimentation” means “sedimentation” as defined in 40 CFR § 141.2, reprinted in Appendix B.
10. (j) “Virus” means “virus” as defined at 40 CFR § 141.2, reprinted in Appendix B.
11. (k) “Waste recycling” means the return of spent filter backwash water, thickener supernatant, and liquids from a treatment solids dewatering processes to the core process for treatment.

Source. #9620, eff 1-1-10; ss by #12533, eff 6-1-18