The state operates under the Oklahoma Storm Water Program, regulated 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 protected 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.
Oklahoma Stormwater Permitting Page
Oklahoma Wastewater Reporting Requirements
Oklahoma Municipal Stormwater Page