Whole House Water Softeners in Duncanville

Duncanville's 2025 report lists exactly one source line, surface water from the City of Dallas, and it says the supply has held the TCEQ's Superior rating. The report names the seven Dallas sources and leaves it there, so the plant side of the story comes from Dallas. In a December 2023 memorandum, Dallas Water Utilities explained that its Sunnyvale plant, East Side, handles lakes Hubbard, Tawakoni and Fork, and that the other two plants, Elm Fork and Bachman, are fed by Ray Roberts, Lewisville and Grapevine through the Elm Fork of the Trinity. Dallas's water quality information page adds three facts a Duncanville homeowner can use: lime and iron sulfate are used in treatment to remove suspended solids and for corrosion control, no groundwater is used anywhere in the Dallas system even though the city sits above an aquifer, and the finished water is non-corrosive.

Hardness in that water is Dallas's to report, and Dallas has. The same memorandum says yes, Dallas has hard water, and puts the system at 120 to 155 mg/L as calcium carbonate. Divided by 17.1, the low end of Dallas's range is about 7 grains per gallon and the high end about 9; on the USGS scale, where 121 to 180 mg/L is hard, all of the Dallas range past its 120 floor lands in the hard band. Duncanville's report prints Dallas's results for nitrate, barium, fluoride, aluminum and manganese, with aluminum and manganese flagged as secondary standards, but no hardness result, so this page gives Duncanville no figure of its own. Nothing between a Dallas plant and a Duncanville meter adds or strips calcium and magnesium; pumping and storage change pressure and water age, not mineral content.

The pumping is Duncanville's own, and there is a fair amount of it. A filing the city made with the Public Utility Commission of Texas, listing the utility sites it needs kept powered, describes the North Main Pump Station at 1110 North Main Street with three distribution pumps, a 5,000,000-gallon ground storage reservoir and a 500,000-gallon elevated tank; the Danieldale Pump Station at 218 East Danieldale Road with four pumps and ground reservoirs of 2,500,000 and 2,000,000 gallons; and the Summit Pump Station at 1839 Straus Road in Cedar Hill, where three pumps draw from an 8,000,000-gallon ground reservoir that Duncanville shares with Cedar Hill. Two more elevated tanks, 1,500,000 gallons on South Clark Road and 1,000,000 gallons on Meadow Crest Lane, and two pressure plane valves, one on East Highway 67 and one on South Main Street, finish the list. Which tank your street hangs off decides your pressure; the water in all of them is the same Dallas blend. Size a softener to 9 grains, where the Dallas range tops out, and use the free water test for the exact reading at your tap.

Sources: City of Duncanville 2025 Annual Drinking Water Quality Report · City of Dallas memorandum to the Quality of Life, Arts and Culture Committee, December 1, 2023 · Dallas Water Utilities: Water Quality Information · USGS Water Science School: Hardness of Water · City of Duncanville filing with the Public Utility Commission of Texas, Project 52299, item 35