The City of Coppell purchases treated water from the City of Dallas Water Utilities. The water comes from Lake Lewisville and from Lake Grapevine, down the Trinity River, and is pumped to the Elm Fork Treatment Plant at I-35 and Whitlock in Carrollton. The water is then put through a treatment process that includes ozone treatment (Dallas has one of the world's largest ozone treatment facilities).
After being treated, the water is pumped into a 54" pipeline that serves Coppell, Irving, DFW Airport and Flower Mound. From the pipeline, Coppell receives water in two separate ground storage tanks (one 4-million gallon and one 6-million gallon) at the Village Parkway Pump Station. From there, the water is pumped into the City's 1.5 and 2 million-gallon elevated storage tanks and into the water line system to supply water and water pressure to residential and commercial customers.