El Paso Water Hardness & Quality Report (2026)

El Paso Water (EPWater) serves approximately 860,000 people across El Paso County, Texas. The utility sources drinking water from surface water via the Rio Grande River, treated at the Canal Street and Anthony facilities, and from groundwater drawn from the Hueco Bolson and Mesilla Bolson aquifers via wellfields including the Northwest and Union Plaza. EPWater manages a blended supply that varies seasonally to meet demand in this desert region near the Mexican border.

The Rio Grande flows through the Chihuahuan Desert, fed by snowmelt from the San Juan Mountains and local runoff, passing through canyons carved into Permian limestones and Tertiary volcanics. Groundwater from the Hueco and Mesilla bolsons occupies structural troughs filled with Rio Grande alluvium, with the Hueco Bolson comprising Quaternary alluvium and Tertiary Santa Fe Group sediments overlying fractured Cretaceous limestones. This geology, dominated by Paleozoic to Cretaceous carbonates and evaporite-influenced sediments, dissolves calcium and magnesium into the blended supply, resulting in hard water through pervasive mineral leaching in arid, fault-bounded basins.

Very hard water causes significant scale buildup in water heaters, dishwashers, washing machines, and showerheads, where mineral deposits clog and corrode over time. Regular vinegar descaling, sediment filters, and periodic system flushing help mitigate issues. EPWater does not recommend softeners for drinking water given the health benefits of natural minerals, but whole-house systems with a bypass for potable use may be considered for appliance protection. Lead compliance is confirmed at 1.1 ppb (90th percentile); notable naturally occurring contaminants include arsenic averaging 6.6 ppb and unregulated chromium-6 at high levels; treatment involves coagulation, filtration, and chlorine disinfection.