Keller Water Hardness & Quality Report (2026)

The City of Keller Utilities Department serves approximately 45,400 residents in Keller, Texas, located in Tarrant and Denton Counties. Water sources include surface water from the Trinity River Authority's reservoirs such as Lake Grapevine and Cedar Creek Lake, supplemented by groundwater from the Trinity Aquifer. Treatment occurs at the Keller Water Treatment Plant using a conventional filtration system. Emergency service is available 24/7 at (817) 743-4522, and annual water quality reports are accessible via the city's public works environmental services page.

The Trinity River watershed drains a vast area of North Texas, feeding reservoirs that supply Keller. The underlying Trinity Aquifer sits within Cretaceous limestone and sandstone formations of the Trinity Group, interacting with overlying Woodbine sands. This karstic geology — featuring soluble carbonate rocks from the Mesozoic era including the Edwards Group — contributes dissolved calcium and magnesium, resulting in a hard supply prone to mineral buildup from natural leaching through the aquifer and river sediments.

Hard water in Keller causes scale accumulation in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and shortening appliance lifespan. White deposits on fixtures and reduced soap lathering are common. Regular descaling with vinegar, installing drain screens, and flushing water heaters biannually help mitigate these effects. A water softener is recommended to prevent scaling and extend appliance life. Keller received a C grade for overall water quality, with 3 contaminants exceeding EPA health-based guidelines; the utility employs conventional treatment including coagulation, sedimentation, filtration, and chlorination.