Irving Water Hardness & Quality Report (2026)

The City of Irving Water Utility serves 240,420 residents across Irving, Texas, drawing water from six reservoirs — Grapevine, Lewisville, Ray Roberts, Ray Hubbard, Fork, and Tawakoni — and the Elm Fork of the Trinity River. Ray Hubbard is the only reservoir completely owned and operated by the City of Dallas. The utility operates a centralized treatment system encompassing settling, filtering, chemical treatment, and disinfection to deliver safe drinking water throughout the city.

Irving's water supply flows through the Trinity River watershed, traversing Cretaceous-age limestone and chalk formations. These sedimentary rocks dissolve readily in water, releasing calcium and magnesium that create a hard supply. Although a Quaternary aquifer exists beneath the Dallas–Irving area, municipal wells have not been used for supply in recent years due to poor aquifer quality. North Texas's limestone bedrock is the primary driver of the region's characteristically hard water.

Hard water in Irving causes scale buildup in water heaters, dishwashers, and washing machines, accelerating equipment wear and reducing efficiency. Soap and detergent effectiveness is reduced, requiring higher doses for cleaning, and regular descaling of fixtures is advisable even with treatment. A water softener is recommended for households and businesses to reduce scale, extend appliance lifespan, and improve cleaning performance. Irving's 2024 Consumer Confidence Report confirms water is safe and meets all EPA standards; treatment includes chloramine, ozone, lime, iron sulfate, activated carbon, and fluoride; arsenic and 1,2,3-trichloropropane were detected above EPA health-based guidelines; PFAS monitoring shows no compounds exceeding guidelines.