The United States Environmental Protection Agency (EPA) regulates stormwater runoff through the National Pollutant Discharge Elimination System (NPDES.) The EPA authorized the Texas Commission on Environmental Quality (TCEQ) to implement the NPDES Stormwater Permitting Program in the state of Texas, making TCEQ responsible for issuing permits and performing compliance and enforcement activities within the state.
The City of McKinney is a part of the Phase II MS4 program. This requires the city to develop a comprehensive stormwater management program that will eliminate illicit discharges to the storm sewer system and reduce pollutants in stormwater runoff.
Learn more about the State of Texas Phase II Program.