Whole House Water Softeners in Highland Village

Highland Village is one of the few cities in southern Denton County that still pumps its own groundwater. The federal facility record lists five city wells, Lake Vista, Oak Street, Highway 407, Highland Shores and Southwood, each paired with a small treatment plant and pump station and with ground storage of 0.3 to 2.0 million gallons, plus two connections for surface water from Upper Trinity's regional plant and two 0.75 million gallon elevated tanks, on Idlewild Court and Nelson Parkway. The city's 2025 report says the water comes from the Trinity Aquifer and Lewisville Lake, calls the groundwater self-supplied and the lake water purchased, and notes that staff adjust the system continually as demand and season change. Upper Trinity's Taylor plant in Lewisville treats the lake water with ozone and chloramine, and the city disinfects its own well water with chloramine as well.

The hardness figure is a range for a reason. In a chart the report says it added because residents ask about appliance requirements, taste and hardness, the city prints 2025 total hardness as calcium carbonate at 1.04 to 110 ppm, with calcium at 1.89 to 37.5 ppm, magnesium at 0.0438 to 3.93 ppm, total dissolved solids (a 2023 result) at 400 to 798 ppm and pH (a 2024 result) at 7.9 to 8.6. On the USGS scale 1.04 is soft, close to zero, under a tenth of a grain per gallon, and 110 is moderately hard, about 6.4 grains. The chart does not label which source produced which end. Two things in the public record are consistent with the spread without settling it: deep Trinity Group wells in the Mustang district to the north test under 6 ppm of hardness with 222 ppm of sodium, and Dallas gives 120 to 155 mg/L for the Lewisville and Ray Roberts water it treats itself. The Texas Water Development Board adds that Trinity groundwater is very hard in its outcrop and gains dissolved solids with depth, so even the well end of the range is a matter of which well and how deep.

For a homeowner the range is the point. A tap fed mostly from the Southwood or Highland Shores well on a given day and a tap running Upper Trinity water can land at either end of the same table, and the city's own report says the mix is adjusted with demand and season. A single softener setting cannot be right for 1 ppm and for 110 ppm at once, and 110 is the figure to plan around: a unit sized for the top of the range runs lightly on soft days and still protects the water heater on hard ones. The free water test reads your tap on the day, in ppm and in grains, and tells you where in the city's range your house actually sits.

Sources: City of Highland Village 2025 Consumer Confidence Report · U.S. EPA Envirofacts SDWIS: water system facilities for TX0610080 · Upper Trinity Regional Water District: Water Treatment and Delivery · Texas Water Development Board: Trinity Aquifer · Mustang SUD 2025 Annual Drinking Water Quality Report · City of Dallas memorandum, December 1, 2023: Community Water Fluoridation Follow Up