Tulsa County enforces stormwater management under its MS4 Phase II permit and Subdivision Regulations. New development in the unincorporated county must control runoff to pre-development rates and submit drainage plans to County Engineering for review, with the City of Tulsa Stormwater Design Criteria Manual frequently adopted as the technical standard given the Arkansas River watershed.
Tulsa County regulates stormwater through its Subdivision Regulations and MS4 Phase II NPDES permit issued by Oklahoma DEQ under 27A O.S. §2-6-101 et seq. Developments disturbing 1 acre or more require an OKR10 construction stormwater permit from DEQ plus a local SWP3 (Stormwater Pollution Prevention Plan). Tulsa County Engineering reviews drainage plans under the Subdivision Regulations, and the City of Tulsa Stormwater Design Criteria Manual is commonly referenced for detention sizing (100-year storm) and water-quality treatment. Because much of the county drains to the Arkansas River and Bird/Mingo Creek basins, detention is typically required so post-development peak flows do not exceed pre-development rates. Illicit discharges to the MS4 are prohibited under the county's IDDE ordinance. Maintenance of private detention ponds is the property owner's ongoing responsibility.
Missing SWP3 or illicit discharge: DEQ and county fines up to $10,000 per day under 27A O.S. §2-6-206. Unpermitted land disturbance: stop-work order plus $500 to $2,500 municipal fines. Failure to maintain detention: notice of violation and escalating daily penalties until corrected.
Owasso, OK
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