State of Oklahoma

Oklahoma Stormwater Laws and Regulations

The state operates under the Oklahoma Storm Water Program, regulatied through NPDES Permit (OKR04) and state regulation Oklahoma Administrative Code 252:606-1-3(b)(3). It is a Phase II MS4 general permit for projects disturbing over an acre or land (including as part of a common plan). The program only applies in the regulated MS4 areas and does not apply to discharges originating on Indian lands. The state program has no numerical standards for post-construction, however the SWPPP is required to address stormwater runoff from new development and redevelopment projects through programs developed to minimize water quality impacts.