Little Elm Water Hardness & Quality Report (2026)

The Town of Little Elm in Denton County, Texas, sources its drinking water primarily from the North Texas Municipal Water District (NTMWD). Key reservoirs include Lake Lavon (primary), Lake Texoma, Jim Chapman Lake, Lake Lewisville, and Lake Ray Roberts. Water is treated at the NTMWD Wylie Water Treatment Plant, rated 'Superior' by the Texas Commission on Environmental Quality (TCEQ), through coagulation with flocculants, sedimentation, chlorination, filtration through coal and sand, plus additions of fluoride, corrosion inhibitors, and pH stabilizers serving the Town of Little Elm and surrounding regions in North Texas.

The supply draws from the Upper Trinity River Basin, with reservoirs underlain by Cretaceous sandstone, limestone, and shale formations of the Gulf Coastal Plain. Underlying geology includes the Woodbine and Trinity aquifers, which influence runoff chemistry through mineral dissolution without being directly tapped as primary sources. Prolonged contact with carbonate-rich limestones and dolomites from ancient Mesozoic marine deposits releases bicarbonates and sulfates into the water, resulting in a hard supply with elevated calcium and magnesium and seasonal algal influences from nutrient-rich lake environments.

The hard water supply promotes scale buildup on showerheads, faucets, aerators, water heaters, and dishwashers, reducing efficiency and lifespan. White, crusty mineral deposits form on fixtures, and soap lathering is less effective, potentially drying skin and hair. Regular cleaning with vinegar, installing aerator screens, and flushing hot water heaters are key maintenance steps; a water softener is recommended for households to mitigate these effects. The system meets all TCEQ and federal standards with 100% non-lead service lines; treatment addresses potential bromate, bromoform, and diquat concerns, and seasonal taste fluctuations from algal blooms, with the 2022 CCR available on record.