Tulsa County requires erosion and sediment control BMPs on all construction sites disturbing one acre or more, consistent with Oklahoma DEQ OKR10 construction stormwater permit. Silt fencing, stabilized construction entrances, and inlet protection are standard, with inspections by county engineering during active grading.
Under Oklahoma's construction stormwater general permit OKR10 (27A O.S. §2-6-101) and Tulsa County's MS4 program, any land-disturbing activity of 1 acre or greater (or smaller if part of a common plan) requires an approved SWP3 detailing erosion and sediment control BMPs. Required measures typically include silt fence along downslope perimeters, stabilized rock construction entrances, inlet protection on existing storm drains, temporary seeding for areas idle more than 14 days, and sediment traps or basins at discharge points. Disturbed areas must be stabilized with vegetation or mulch within 14 days of final grading. Tornado Alley weather and intense spring rainfall on the Arkansas River plain make timely stabilization critical. Weekly and post-rain-event inspections are required under the OKR10 permit, and logs must be kept on-site.
Failure to install or maintain BMPs: stop-work order and fines $250 to $2,500 per day. Sediment discharge to waters of the state: DEQ penalties up to $10,000 per day per 27A O.S. §2-6-206. Falsified inspection logs: criminal referral possible.
Tulsa County, OK
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