The City’s drinking water maintains its rating of “Superior Public Water Supply,” the highest rating given by the Texas Commission on Environmental Quality, by meeting and exceeding state and federal standards. On June 2, 1999, the Water Treatment Plant received its first Texas Optimization Program (TOP) award for meeting the most stringent water quality standards that are still in effect. Lewisville was the fourth public water system in Texas to achieve this high level of treatment efficiency.

The City gets its water supply from Lewisville Lake with the capability of producing over 20 MGD. Treated water is also purchased from the City of Dallas to supplement our drinking water supply. Lewisville has a total system capacity of 53.4 million gallons per day (MGD).

Lewisville has an annual average daily consumption of 17.6 MGD. During the summer months when water demands are the greatest, the water system may experience daily demands as high as 31 MGD, while winter demands may dip below 11 MGD. The majority of the high usage in the summer can be attributed to irrigation and other outdoor water usage although North Texas lawns only need to be watered twice per week, at the most.  Additional information regarding irrigation use can be found at watermyyard.org.  For more information on how you can help conserve water, visit the Water Conservation webpage and for water restrictions and watering schedule, visit the outdoor watering restrictions webpage.

Water Treatment Plant personnel can be reached at 972.219.3540.