5 county-level rules, plus city-specific rules for 3 cities in Oklahoma County, Oklahoma.
Verified from official government sources
Oklahoma County falls under OKC's MS4 permit (OKS000201) with ODEQ oversight under 27A O.S. §2-6-301 et seq. Oklahoma City requires stormwater plans for new development over 1 acre per OKC §40-201. Post-construction BMPs mandatory. Tornado Alley location makes detention basins critical.
Okla. Stat. tit. 27A, §§ 2-6-202 to 2-6-203 (OPDES Act)
§27A-2-6-202. Definitions. For purposes of the Oklahoma Pollutant Discharge Elimination System Act:... 8. "Storm water" means rain water runoff, snow melt runoff, and surface runoff and drainage. Added by Laws 1992, c. 398, § 14, eff. July 1, 1993. Amended by Laws 1993, c. 145, § 63, eff. July 1, 1993. §27A-2-6-203. Powers and duties of Board - Authority of Department. A. The Board shall have t...
Oklahoma County erosion control tied to ODEQ OKR10 general permit for construction sites over 1 acre. Oklahoma City §40-203 requires silt fencing, stabilized entrances, and inlet protection. Red clay soil and tornado-season rainfall make erosion measures essential. Stabilization required within 14 days of inactivity.
Oklahoma County is landlocked with no coastline, but riparian buffers apply along North Canadian River, Deep Fork River, and Lake Hefner/Overholser. Oklahoma City §40-221 requires 50-foot setbacks from perennial streams. Wetland fills need Army Corps Section 404 permits. Floodplain restrictions under FEMA NFIP.
Oklahoma County participates in FEMA's National Flood Insurance Program (NFIP). Significant flood zones exist along the North Canadian River and its tributaries. Floodplain development permits required for construction in Special Flood Hazard Areas (SFHA).
Oklahoma County grading regulated by OKC §155-40 requiring permits for excavation or fill over 50 cubic yards. Drainage cannot be redirected onto neighbors under Oklahoma common law (Thompson v. Andrews). Retaining walls over 4 feet require engineered plans. Red clay soil demands proper compaction.
3 cities in Oklahoma County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
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