Each figure below comes from the local utility's own published data. Hardness varies by neighborhood and over time, so check your utility's latest report.
| City | Hardness (utility figure) |
|---|---|
| Tucson | ~228 mg/L, ~13.3 gpg (2024 report)1,2 |
| Phoenix | 172–302 ppm, 10–17.6 gpg (2025 report)3 |
| Las Vegas | 280 ppm, 16 gpg (LVVWD)4 |
| San Antonio | Typically 15–20 gpg (SAWS)5 |
| El Paso | ~175 mg/L, ~10.2 gpg average6 |
Ready to treat it? Start with softener vs. RO.
Sources
- Tucson Water 2024 Annual Water Quality Report (Main System)
- Tucson Water Pros: summary of the 2024 report (≈228 ppm / 13.3 gpg)
- City of Phoenix 2025 Water Quality Report
- Las Vegas Valley Water District Water Quality Report
- San Antonio Water System: water quality FAQs
- El Paso Water: chemical analysis
Last reviewed Oct 13, 2026. This is general information, not professional advice. Confirm figures with your utility and installer.