In the City of Coppell, stormwater quality is regulated at the federal level by the Environmental Protection Agency (EPA), the state level by the Texas Commission on Environmental Quality (TCEQ), and at the local level by the City of Coppell Environmental Health Division.
As authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDES) permit program controls water pollution by regulating point sources that discharge pollutants into waters of the United States. Point sources are discrete conveyances such as pipes or man-made ditches. Individual homes do not need an NPDES permit; however, some industrial, municipal, and other facilities must obtain permits if their discharges go directly to surface waters.