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 waste water transportation* and treatment services for all or portions of four cities. The system includes a 4.5 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, and advanced tertiary filtration. Disinfection of the treated wastewater is achieved through exposure to ultraviolet lamps. The waste solids are dewatered through a belt press unit and disposed of offsite in a landfill.

Growth in the MCRWS customer base necessitated adding a 7.0 MGD peak flow storage basin and a 6.0 MGD expansion, which is in the construction phase.

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 through pipes from customer cities to the treatment plant.

MCRWS Numbers FY2024


  • Grand Prairie 
  • Mansfield 
  • Midlothian 
  • Venus 

Trinity River Authority of Texas

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