Texas cities with sourced hardness data
6 cities so far. More metros will be added after we read their Consumer Confidence Reports or utility FAQs.
| City | Hardness | Class | Source year |
|---|---|---|---|
| Round Rock | 15.1 gpg avg | very hard | 2025 |
| San Antonio | 15–20 gpg | very hard | 2024 |
| Kyle | 16.1–17.3 gpg | very hard | 2025 |
| El Paso | 10.2 gpg avg | hard | 2017 |
| Fort Worth | 6–9 gpg | hard | 2025 |
| Austin | 5.4 gpg avg | moderately hard | 2025 |