Point of Interest CRWS-scans-4-08-11-a-(7)(1) (1)
TRA's Central Regional Wastewater System is the third largest wastewater treatment plant in Texas.

Mountain Creek Regional Wastewater System

IMG_8591The Mountain Creek Regional Wastewater System provides regional wastewater transportation* and treatment services for all or portions of four cities. The system includes a 3.0 MGD treatment plant located in the city of Midlothian, as well as a lift station, force mains, gravity wastewater pipelines, and metering facilities. The Authority owns, operates, and maintains the regional pipeline facilities and the biological treatment plant utilizing an activated sludge process, disinfection of the treated wastewater through exposure to ultraviolet lamps, and a belt press to dewater biosolids. The biosolids are disposed of in an off-site municipal landfill.

Construction has begun on a seven-million-gallon peak flow storage basin for service in early 2022. An expansion to 4.5 MGD is under construction that will provide further relief allowing the plant to treat increasing flows in the service area as customer cities continue to develop. Design for a 6.0 MGD expansion is underway.

outfall - CopyMCRWS has earned the National Association of Clean Water Agencies' Peak Performance gold and silver awards for compliance with its National Pollution Discharge Elimination System permit.

*Transportation denotes the movement of wastewater from customer cities to the treatment plant. 



  • Grand Prairie 
  • Mansfield 
  • Midlothian 
  • Venus 

Trinity River Authority of Texas

Mountain Creek Regional Wastewater System
1717 Auger Road, Midlothian, Texas 76065