Norman, OK Environmental Rules: Erosion Control (2026)

NCC 30-513 governs erosion and sediment control for subdivision development citywide. Vegetative cover and erosion or sedimentation control measures must be completed either when the drainage improvements themselves are installed, or, lot by lot, after all lots in the plat are improved but before the Public Works Department signs off on final inspection. A developer who defers the work must post one of two sureties to the City Council through the Director of Public Works: a cash deposit or certificate of deposit sized to an engineer's cost estimate, due within six months of City Council acceptance of the subdivision improvements, or a four-year corporate surety bond, cash, or irrevocable letter of credit, renewable if the work is still incomplete when the bond expires. If the six-month cash surety lapses without completed work, the City calls the surety and installs the measures itself. All measures must follow the City's Standard Specifications, Construction Drawings and Engineering Design Criteria and must be shown on the drainage plans before the City accepts the subdivision's other drainage improvements.

Separately, NCC 6-105(h) folds erosion control into the building permit process citywide. Any building permit for new construction, an addition, a swimming pool, a driveway, or a parking area that creates more than 500 square feet of new impervious surface carries an erosion control fee (Appendix A, City of Norman Fee Schedule). Residential lots larger than two acres are exempt if the added impervious area stays under 5,000 square feet, and no fee applies when no new impervious area is created. Land-disturbing work also needs a separate earth change permit, referenced to section 1005.2 of the City Engineering Design Criteria.