Kerrville Water Hardness & Quality Report (2026)

The City of Kerrville Water Utility serves approximately 23,254 residents in Kerr County, Texas, drawing its supply from surface water sources in the Hill Country region. The utility operates conventional treatment methods including chlorine disinfection and filtration. The main service address is located at 701 Main Street, Kerrville, TX 78028, with 24/7 emergency contact available through the city's preparedness line. Annual Water Quality Reports are published by the utility, and a Standard Water Analysis Package is offered through its laboratory to provide residents with detailed water quality information.

Kerrville's water supply originates from the Guadalupe River watershed, which flows through the Texas Hill Country. The underlying geology is characterized by Cretaceous-age limestone and dolomite formations, particularly the Edwards Formation, which is highly soluble and contributes substantial quantities of dissolved calcium and magnesium to the water. This karst terrain naturally produces a very hard water supply typical of central Texas.

The very hard water in Kerrville creates significant practical challenges for residents. Scale buildup occurs rapidly in water heaters, dishwashers, washing machines, and pipes, reducing efficiency and lifespan. Soap and detergent effectiveness is diminished, requiring higher doses for cleaning. Most water treatment professionals recommend installation of a water softening system to protect plumbing infrastructure, reduce energy costs, and improve cleaning performance. According to the City of Kerrville's water quality data, the utility has reported 22 contaminants above EPA health-based guidelines (MCLGs), with 2 MCL violations documented; detected contaminants include tetradecanoic acid, metolachlor, monochloroacetic acid, and total trihalomethanes (TTHMs).