San Antonio, Texas water hardness
Utility: San Antonio Water System (SAWS). Metro: San Antonio.
| Measure | Value |
|---|---|
| Hardness as CaCO3 (mg/L or ppm) | 256.5 to 342 mg/L |
| Hardness (grains per gallon) | 15 to 20 gpg |
| USGS class on this site | very hard |
| Data year | 2024 |
| Retrieved | 2026-11-09 |
Source: SAWS Water Quality FAQs. Open the source.
Utility publishes typical hardness as 15 to 20 gpg. mg/L range converted at 17.1 mg/L per grain. Midpoint not published by SAWS.
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