How to use this Texas guide
Texas is too large for a single hardness answer. Houston has system-specific tables, El Paso has source-backed hard-water context, and other major cities depend on local utility reporting.
Use this guide to compare reviewed city profiles, then confirm the actual provider for the address. For softener sizing, scale problems, or appliance concerns, a direct hardness test is usually the cleanest next step.
Open the city profile first. If the page gives a source-backed value, use it as a planning clue. If the page says to confirm with the utility or test, do not treat the city name as a final answer.
Reviewed Texas cities
| City | Hardness | What matters locally |
|---|---|---|
| Austin | Confirm with utility or test | Austin Water context is clear; test directly if exact hardness matters. |
| Corpus Christi | Confirm with utility or test | Source and supply details matter alongside routine report results. |
| Dallas | Confirm with utility or test | Dallas Water Utilities context without a safe public hardness value. |
| El Paso | 175 mg/L | Official average is useful, but source ratios can change. |
| Fort Worth | Confirm with utility or test | North Texas provider and wholesale context matter near service edges. |
| Frisco | Confirm with utility or test | Purchased-water and regional supply context can matter. |
| Houston | 43.4-180 ppm / mg/L as CaCO3 | System-specific hardness ranges make address/system matching important. |
| San Antonio | Confirm with utility or test | SAWS context; direct testing for hardness-sensitive equipment. |
City notes
Austin
Austin Water context is clear; test directly if exact hardness matters.
Corpus Christi
Source and supply details matter alongside routine report results.
Dallas
Dallas Water Utilities context without a safe public hardness value.
El Paso
Official average is useful, but source ratios can change.
Fort Worth
North Texas provider and wholesale context matter near service edges.
Frisco
Purchased-water and regional supply context can matter.
Houston
System-specific hardness ranges make address/system matching important.
San Antonio
SAWS context; direct testing for hardness-sensitive equipment.
Why state averages can mislead
Water hardness is local. Averages can hide major differences between surface water and groundwater, city and county utilities, seasonal source changes, and building-level plumbing.