Wastewater Treatment

Stewart Creek Wastewater Treatment Plant was built in the late 1980’s to serve

the City of The Colony.

The original treatment plant capacity was 1.5 million gallons per day.  Through the years with city growth, the treatment plant has expanded twice to accommodate the population.  As of 2010 the treatment plant has a capacity of treating 4.5 million gallons per day and serves the entire city.  The treatment plant is owned and operated by the City of The Colony.  Through biological treatment, the wastewater we receive is processed and converted to Class B biosolids which are transported to area landfills.  The effluent water produced is then cleaned, filtered and then disinfected before discharging into Lewisville Lake.

The wastewater Treatment Plant is regulated under a permit issued by The Texas Commission of Environmental Quality (TCEQ). The Texas Pollutant Discharge Elimination System (TPDES) permit contains effluent limits to insure a healthy quality of water. The program also consists of monthly reporting to the TCEQ as well as record keeping, monitoring and testing.  Along with the treatment plant, there are several lift stations around the city that help the wastewater get to the plant.  The operation of the plant is continuous 24/7 365 days a year. Throughout the year we give tours of the plant so people understand how it all works. If ever interested in a tour please contact City Hall to arrange a tour. They can be reached at 972-625-1756.




  • Average daily flow through the plant is 2.78 million gallons per day
  • Biosolids production average is 1200 tons per year
  • Reuses treated effluent to the Stonebriar Golf Course    

Wastewater Capital Improvement Plan




Contact Information





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Hours: Monday - Friday 8:00am - 5:00pm
Address:  6800 Main St. The Colony, Texas 75056
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