residential gray water - Permitting. A. The Department of Environmental Quality shall not require a permit for applying less than two hundred fifty (250) gallons per day of private residential gray water originating from a residence for the household gardening, composting or landscape irrigation of the resident if: 1. A constructed gray water distribution system provides for overflow into the sewer system or on-site wastewater treatment and disposal system; 2. A gray water storage tank is covered to restrict access and to eliminate habitat for mosquitoes or other vectors; 3. A gray water system is sited outside of a floodway; 4. Gray water is vertically separated at least five (5) feet above the groundwater table; 5. Gray water pressure piping is clearly identified as a nonpotable water conduit; 6. Gray water is used on the site where it is generated and does not run off the property lines; 7. Gray water is applied in a manner that minimizes the potential for contact with people or domestic pets; 8. Ponding is prohibited, application of gray water is managed to minimize standing water on the surface and to ensure that the hydraulic capacity of the soil is not exceeded; 9. Gray water is not sprayed; 10. Gray water is not discharged to a waterway; 11. Gray water use within municipalities or counties complies with all applicable municipal or county ordinances enacted pursuant to law; and 12. A gray water storage system which complies with the provisions of this section may allow for rainwater to be introduced into the system. B. For purposes of this section, “gray water” shall be deferred as provided for in Section 2-6-107 of Title 27A of the Oklahoma Statutes.
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