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

Erosion control in Denton County is enforced through local development ordinances and the TPDES Construction General Permit administered by TCEQ. All construction and land-disturbing activities must implement erosion and sediment control best management practices (BMPs) to prevent soil from leaving the project site and entering waterways or storm drains. Standard required BMPs include silt fencing along the downslope perimeter of the site, construction entrance stabilization with rock or gravel pads, inlet protection for nearby storm drains, temporary seeding or mulching of exposed soil within 14 days of final grading, and concrete washout containment areas. Projects disturbing one acre or more must file a Notice of Intent with TCEQ, obtain TPDES permit coverage, and maintain a SW3P on site accessible for inspection at all times. Cities within Denton County conduct regular inspections of construction sites to verify BMP installation and maintenance. The City of Denton requires erosion control plans as part of the grading permit application and conducts inspections after significant rain events. Flower Mound has particularly detailed erosion control requirements due to the sensitive Cross Timbers ecology in the area. Residential construction on individual lots must also include basic erosion controls even when the lot is smaller than one acre, as required by local grading permits.