Oklahoma County, OK Environmental Rules: Erosion Control (2026)

Oklahoma County regulates erosion through Oklahoma DEQ's Construction General Permit (OKR10) under 27A O.S. §2-6-105 and municipal amendments. Oklahoma City §40-203 and Edmond Code §24-61 require erosion and sediment control plans for all land-disturbing activities over 1 acre, with smaller thresholds (as little as 5,000 sq ft) when near waterways. Standard BMPs include silt fencing along the downhill perimeter, stabilized construction entrances using 3-inch clean stone, inlet protection on all storm drains, erosion control blankets on slopes over 3:1, straw wattles along contours, and sediment basins for sites over 5 acres. Oklahoma's characteristic red clay soil erodes easily during tornado-season spring rains, making BMPs critical. Disturbed areas inactive for 14 days or more must receive temporary stabilization (seeding, mulching, or hydroseeding). Permanent stabilization via vegetation or hardscape required within 7 days of final grading. Inspections conducted weekly and after each 0.5-inch rainfall event. SWPPP must be kept on-site during construction. ODEQ enforces through OKR10 permit, while OKC Development Services handles local inspections.