Leon Valley Water Hardness & Quality Report (2026)

The City of Leon Valley Public Water System supplies water to roughly 11,000 residents in Leon Valley, Texas, a San Antonio suburb located in Bexar County. Its water originates from two main sources: the Edwards Aquifer, a significant groundwater source, and wholesale purchases from the San Antonio Water System (SAWS). SAWS blends Edwards Aquifer groundwater with surface water drawn from Canyon Lake reservoir and the Guadalupe River basin. Water treatment is handled at SAWS facilities, including the large Dos Rios Water Treatment Plant and the Aldea Road plant, utilizing conventional filtration and chloramination before distribution.

The Edwards Plateau and Balcones Fault Zone form the primary watershed where water replenishes the Edwards Aquifer through sinkholes and faults. This Cretaceous limestone aquifer, dating back 100 to 145 million years, is characterized by highly permeable karst features. These features allow for rapid water infiltration but also extensive dissolution of minerals like dolomite and calcite found in the strata. Surface water sources from Canyon Lake originate from the Upper Guadalupe River Basin, which also flows over similar limestone terrains. The aquifer's karst nature consistently results in a hard water supply rich in calcium and magnesium.

Homeowners in Leon Valley will likely notice the effects of very hard water, which causes significant limescale buildup in pipes, water heaters, dishwashers, and coffee makers, potentially reducing their efficiency by up to 30% and shortening their lifespan. You might find yourself using more detergent for laundry and dishes, and glassware may develop spots even after cleaning. To manage this, consider descaling appliances monthly with vinegar, installing sediment pre-filters, and having plumbing inspected annually. Given the high hardness levels, installing a water softener is highly recommended to protect your infrastructure and improve cleaning effectiveness. The water's pH typically falls between 7.5 and 8.5, and while the system complies with EPA standards, low levels of nitrate and disinfection byproducts like TTHMs have been detected.