Cameron County, TX Environmental Rules: Erosion Control (2026)

Appendix C of the county's Flood Damage Prevention and Building Regulations, tied to County Order No. 201105032, lays out the erosion control package every site development permit application has to include. At a minimum, every site needs a Site Development Permit Erosion Control Plan, covering a natural resources map at a scale no smaller than 1 inch to 100 feet identifying soils, forest cover and protected resources, a construction timeline showing when clearing starts and how long cleared ground stays exposed, the specific erosion and sediment control measures used through every phase of construction and after the site is finished, seeding mixtures and mulching methods for temporary and permanent vegetative cover, and who maintains the control facilities once installed.

Projects disturbing one acre or more step up to a full Storm Water Pollution Prevention Plan following the state's Construction General Permit template, describing the construction activity, potential pollutants, drainage patterns, nearby surface waters, and the best management practices used to keep runoff clean. Disturbing 10 acres or more adds a sediment basin requirement, and any project disturbing 5 acres or more has to submit copies of its state permits, including the primary and secondary large-construction-site notices and the Notice of Intent for each operator, before the county will sign off.