Colleyville Water Hardness & Quality Report (2026)

Colleyville, Texas, in Tarrant County in the Dallas-Fort Worth Metroplex, receives its municipal water from the City of Colleyville's Public Works Department, which purchases treated wholesale water from Trinity River Authority (TRA) and City of Fort Worth Water — both sourcing from Lake Grapevine and Lake Lewisville on the West Fork and Elm Fork of the Trinity River. Treatment at TRA and Fort Worth facilities processes surface water before it enters the regional transmission grid and reaches Colleyville's residential distribution system.

The extreme 418.5 mg/L hardness — one of the highest in the Dallas-Fort Worth suburbs — reflects the West Fork Trinity River's intensive contact with Cretaceous carbonate geology of North Texas. The river and its tributaries drain across the Comanche Peak Limestone, Glen Rose Formation (a thick dolomite and limestone sequence), Paluxy Sandstone, and Fredericksburg Group carbonates — a succession of Cretaceous shallow-marine limestones and dolomites exceptionally rich in calcium and magnesium. Warm Texas temperatures and high evapotranspiration further concentrate dissolved minerals in reservoir storage, amplifying hardness before treatment.

At 418.5 mg/L with TDS of 1,310.7 mg/L, Colleyville has among the hardest municipal water in the DFW Metroplex. Scale accumulates within days in kettles, water heaters lose efficiency rapidly, and showerheads clog within weeks without maintenance. Glass shower doors become permanently etched without daily treatment. A whole-house water softener is a necessity, not a luxury, for protecting plumbing, appliances, and fixtures in Colleyville. An under-sink reverse osmosis system is equally essential for drinking and cooking water — the extreme TDS and elevated PFAS of 11.9 ppt both make treated drinking water strongly advisable.