Round Rock, Texas water hardness
Utility: City of Round Rock. Metro: Austin-Round Rock.
| Measure | Value |
|---|---|
| Hardness as CaCO3 (mg/L or ppm) | 258 mg/L average, 100 to 358 mg/L |
| Hardness (grains per gallon) | 15.1 gpg average, 5.8 to 20.9 gpg |
| USGS class on this site | very hard |
| Data year | 2025 |
| Retrieved | 2026-11-09 |
Source: City of Round Rock CCR 2025 hardness table. Open the source.
2025 table average 258 ppm (range 100 to 358). Same PDF prose still cites 249 mg/L / 14.55 gpg from an older year. Site uses the 2025 table. gpg from 258/17.1.
What this means at home
Hard water can leave scale on fixtures and appliances and can reduce soap lather. It is not listed as a health contaminant on EPA’s secondary standards list. A softener or whole-house filter is a purchase decision based on your fixtures, taste preferences, and a test of your own tap, not on a city average alone.
Product research placeholders
- SpringWell whole-house systems: #TODO-affiliate-springwell
- Aquasana filtration: #TODO-affiliate-aquasana
- SoftPro softeners: #TODO-affiliate-softpro