Georgetown Water Hardness & Quality Report (2026)

Georgetown, Texas, the Williamson County seat north of Austin on I-35 — consistently ranked as one of the fastest-growing cities in the United States throughout the 2010s–2020s, with a distinctive Victorian downtown square — draws its municipal water supply from both the Edwards Aquifer (Barton Springs segment wells) and Lake Georgetown (North Fork San Gabriel River reservoir in the Texas Hill Country) via the Georgetown Utility Systems Water Division, treating a blend of calcareous Edwards groundwater and surface water from the Hill Country lake. Water hardness in Georgetown measures 126.5 mg/L — classified as moderately hard.

Georgetown's moderate hardness — far below neighboring Cedar Park (414 mg/L) and other pure-Edwards Texas Hill Country supplies — reflects the Lake Georgetown surface water dilution of the Edwards Aquifer groundwater. The Lake Georgetown reservoir on the North Fork San Gabriel River drains the northern Burnet County and Williamson County Texas Hill Country — the Cretaceous Edwards Limestone and Glen Rose Formation are calcareous, but surface water from the Hill Country reservoir is notably softer than the pure Edwards Aquifer groundwater (which reaches 300–500+ mg/L). The Georgetown Utility Systems blend of softer Lake Georgetown surface water with the hard Edwards groundwater produces the moderate 126.5 mg/L — Georgetown's supply blending strategy is more favorable than the pure Edwards supply communities.

At 126.5 mg/L, Georgetown residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Georgetown Utility Systems Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.