"Wastewater" means a combination of the liquid- and water-carried wastes from a residence, commercial building, industrial plant or institution and any groundwater, surface water or storm water that is present. The term includes any pollution having a source that cannot be identified and which may best be controlled by the implementation of a program for management established pursuant to 33 U.S.C. § 1329.
Nev. Admin. Code § 445A.727
NRS 445A.135