Austin: moderately hard
Austin Water's 2025 water quality report puts average hardness at 93 mg/L, about 5.4 grains per gallon, ranging roughly 4.1 to 7.4 grains. That's moderately hard. The water comes from the Colorado River through Lake Travis and Lake Austin.
Plenty of Austin homes do fine without a softener. If you see heavy scale on fixtures or your water heater, a softener can still help, but don't let anyone sell you one on a 20-grain number that isn't your water.
Round Rock and Georgetown: genuinely hard
Round Rock's 2024 report lists hardness around 249 mg/L, roughly 14.6 grains per gallon. Georgetown varies by treatment plant, from about 10 to 11 grains at the lake plants to around 19 at its groundwater plants. At those levels a softener protects water heaters, tankless units and fixtures.
The taste is chloramine, not hardness
Austin disinfects with chloramine, averaging about 2.3 ppm in the 2025 report, within EPA limits. If what bothers you is a chlorine-like taste or smell, a softener won't fix it. A carbon filter rated for chloramine, or reverse osmosis at the kitchen sink, will.
What it means for your water heater
Harder water means more scale in tanks and tankless heat exchangers. Flush a tank heater yearly and descale a tankless unit on schedule, more often in Round Rock and Georgetown.
- Austin: flush yearly, softener optional
- Round Rock and Georgetown groundwater areas: softener worth considering
- Well water: test before you buy anything
Sources: Austin Water 2025 water quality report · Round Rock 2024 water report · Georgetown water hardness