Okla. Stat. tit. 27A, § 27A-2-6-101

For purposes of this article:

1. "Aquifer storage and recovery (ASR)" means delivery of water

into an aquifer for later recovery and use;

2. "Disposal system" means pipelines or conduits, pumping

stations and force mains and all other devices, construction,

appurtenances and facilities used for collecting, conducting or

disposing of wastewater, including treatment systems;

3. "Drainage basin" means all of the water collection area

adjacent to the highest water line of a reservoir which may be

considered by the Department to be necessary to protect adequately

the waters of the reservoir. The area may extend upstream on any

watercourse to any point within six hundred (600) feet of the

highest water line of the reservoir;

4. "Indirect discharge" means the introduction of pollutants to

a publicly owned treatment works from a nondomestic source;

5. "Pollutant" means dredged spoil, solid waste, incinerator

residue, sewage, garbage, sewage sludge, munitions, chemical wastes,

biological materials, radioactive materials, heat, wrecked or

discarded equipment, rock, sand, cellar dirt and industrial,

municipal, and agribusiness waste discharged into waters of the

state;

6. "Public water supply" means water supplied to the public for

domestic or drinking purposes;

7. "Reservoir" means any reservoir, whether completed or in the

process of construction, whether or not used as a water supply, and

whether or not constructed by any recipient of water therefrom;

8. "Sludge" means nonhazardous solid, semi-solid, or liquid

residue generated by the treatment of domestic sewage or wastewater

by a treatment works, or water by a water supply system, or manure,

or such residue, treated or untreated, which results from

industrial, nonindustrial, commercial, or agribusiness activities or

industrial or manufacturing processes and which is within the

jurisdiction of the Department;

9. "Small public sewage system" means a nonindustrial

wastewater treatment system which has an average flow of five

thousand (5,000) gallons per day or less;

10. "Treatment works" means any facility used for the purpose

of treating or stabilizing wastes or wastewater. "Treatment works"

shall be synonymous with "wastewater works"; and

11. "Water supply system" means a water treatment plant, water

wells, and all related pipelines or conduits, pumping stations and

mains and all other appurtenances and devices used for distributing

drinking water to the public and, as such, shall be synonymous with

waterworks.