San Angelo Water Hardness & Quality Report (2026)

The City of San Angelo Water Utilities Department serves approximately 100,000 residents across Tom Green County and surrounding areas in West Texas. Primary surface water sources include O.H. Ivie Reservoir, Lake Spence, O.C. Fisher Reservoir, Twin Buttes Reservoir, and Lake Nasworthy, fed by the Concho River. Supplementary groundwater is drawn from the Hickory Aquifer via pipelines up to 70 miles long. Water is treated at the main Water Treatment Plant and distributed through five pumping stations — including two ground storage tanks and three elevated tanks — delivering 9–30 million gallons daily. Monthly water quality reports and annual Consumer Confidence Reports (CCR) are available from the utility.

The Concho River watershed spans the Edwards Plateau, underlain by Permian Basin limestones and Cretaceous formations that dissolve calcium and magnesium into the water, yielding a hard supply. The Hickory Aquifer taps into deeper sandy and conglomeratic strata of Paleozoic age, adding further mineralization. Blending surface water from mineral-rich reservoirs with Hickory Aquifer groundwater moderates but maintains the mineralized profile. The semi-arid climate promotes high evaporation rates that concentrate dissolved solids without softening influences from siliceous rocks or peat.

Very hard water scales pipes, heaters, and fixtures, shortening appliance life — particularly water heaters and dishwashers. Soap lathering is poor, increasing detergent use and leaving spots on glassware. Regular vinegar descaling, magnetic conditioners, or template-assisted crystallization help mitigate buildup. A whole-house water softener is recommended to protect plumbing and improve efficiency, though added sodium should be monitored for low-sodium diets. Third-party tests note arsenic exceeding health guidelines from natural soil and bedrock sources, addressed via treatment. Conventional treatment includes coagulation, filtration, and disinfection.