Denton County, Texas: drinking water report. Denton County sits in the north Dallas-Fort Worth metro, home to about 950,000 residents in one of the…
Denton County sits in the north Dallas-Fort Worth metro, home to about 950,000 residents in one of the fastest-growing counties in Texas. Water comes primarily from the Upper Trinity Regional Water District and the North Texas Municipal Water District, drawing from Lake Lewisville, Ray Roberts Lake, and Lake Chapman. Cities like Denton, Flower Mound, and Lewisville each have their own distribution systems but largely rely on these regional wholesale providers.
Denton County's surface water reservoirs are relatively clean compared to Texas river systems that pass through heavy industrial corridors. UCMR5 data shows low-level PFAS detections in county water systems, consistent with diffuse contamination from consumer products and wastewater effluent rather than military or industrial point sources.
The primary quality concern here mirrors much of north Texas: water hardness and total dissolved solids. According to the Upper Trinity Regional Water District's 2024 water quality report, TDS levels averaged between 350 and 480 mg/L across the system – high enough to affect taste and cause scale buildup in plumbing and appliances.
Denton County's water meets federal standards, and the contamination picture is better than many Texas counties. Hardness and taste are the most common complaints from residents.
Check your water for data specific to your provider and ZIP code. A water softener addresses hardness, while a reverse osmosis system under the sink handles taste, TDS, and any PFAS present. Our water filter guide covers both. Pull your detailed report, and see our Texas page for statewide data.