Pflugerville Water Hardness & Quality Report (2026)

Pflugerville, Texas, in Travis County north of Austin — one of the fastest-growing cities in Texas and in the United States, a major Austin north corridor suburb with significant tech industry employment (Tesla Gigafactory nearby, Samsung campus) — draws its municipal water supply from the Edwards Aquifer and local Brushy Creek watershed wells via the City of Pflugerville Utilities Water Division. Water hardness in Pflugerville reaches an extreme 434 mg/L — classified as extremely hard, among the highest recorded hardness for a major US municipal supply.

Pflugerville's extreme hardness reflects the Edwards Aquifer at the north Travis County–Williamson County border near its maximum dissolution zone. The Edwards Group Cretaceous Limestone (Kainer, Person, and Leona limestone members) in north Travis County at the Balcones Escarpment Zone stores groundwater with extremely high calcareous dissolution from the pure, thick Edwards Limestone karst system. North Travis County communities (Pflugerville, Round Rock, Cedar Park) sit directly above the Edwards Aquifer recharge zone and draw from the freshest, most concentrated Edwards water — before any dilution from the larger metropolitan spring discharge (San Marcos, Comal Springs) that slightly reduces hardness further downstream. At 434 mg/L, Pflugerville's supply is comparable in mineral intensity to San Marcos (440 mg/L) and Leander (419.5 mg/L).

At 434 mg/L, Pflugerville is one of the most extreme hard water communities in the United States. Scale forms within hours on all surfaces. Daily descaling of fixtures is necessary. Water heaters require professional descaling annually. City of Pflugerville Utilities consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements, but home water softeners are strongly advisable.