Okla. Stat. tit. 2, § 2-2A-8: Rules for storm water discharges

The State Board of Agriculture shall promulgate rules which

prescribe permit requirements applicable to discharges composed

entirely of storm water that shall at a minimum meet federal law.

The rules may require permits on a case-by-case basis, exempt

categories of discharges, or provide a schedule for obtaining the

permit. The Board shall have promulgated rules for storm water

discharges which comply with Environmental Protection Agency

requirements for approval of the state National Pollutant Discharge

Elimination Systems program no later than the date that the

Department is to receive authorization to administer a state

National Pollutant Discharge Elimination System program.