Water Hardness in Texas
Is Texas Water Hard or Soft?
Texas water is hard on average at 210 PPM (12.3 GPG). Local readings can vary by utility, aquifer, treatment plant, and private well use.
75% of covered ZIPs use treated-water records or USGS monitoring, so the state report has relatively strong source support.
How to read the Texas results
State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.
Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.
Data Source Coverage
ZIP-level source mix for Texas; higher direct and USGS coverage means less reliance on regional estimates.
In Texas, 49% of ZIPs use verified treated-water records, 26% use high-confidence USGS monitoring, and 25% use estimates that should be confirmed locally for treatment decisions.
What the Data Shows in Texas
Hard water is common but not universal in Texas: 40% of classified ZIPs are hard or very hard.
Texas uses a mixed data profile across treated-water records, USGS monitoring, and estimated fallback values.
Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.
ZIP Hardness Distribution
Treatment Takeaway
For many homes in Texas, hardness is high enough that scale buildup, fixture spotting, and appliance wear are realistic concerns. A local test is the best starting point before sizing a softener.
How to Use This Data
The source coverage is relatively strong in Texas, so these pages are useful for comparing local patterns before confirming your home's exact hardness.
Source-Backed Water Systems in Texas
Large systems with treated-water reports or USGS monitoring behind the state rollup.
| Water system | Hardness | Source label | Population |
|---|---|---|---|
| San Antonio Water System TX0150018 - Bexar County | 300 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 2,113,151 |
| Dallas Water Utility TX0570004 - Dallas County | 150 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 1,356,479 |
| City Of Austin Water & Wastewater TX2270001 - Travis County | 120 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 1,115,323 |
| City Of Fort Worth TX2200012 - Tarrant County | 100 PPM Slightly Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 955,900 |
| El Paso Water Utilities Public Service B TX0710002 - El Paso County | 175 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 747,168 |
| City Of Arlington TX2200001 - Tarrant County | 100 PPM Slightly Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 405,420 |
| City Of Corpus Christi TX1780003 - Nueces County | 310 PPM Very Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 318,387 |
| City Of Plano TX0430007 - Collin County | 150 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 292,059 |
Useful Texas City Pages
Shortcuts to city pages backed by more ZIP-code or water-system data.
Cities With More Local Data
Prioritize cities with multiple ZIPs and systems, then use source badges on each city page to separate verified treated-water records from estimates.
Top 10 Hardest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Zephyr | Very Hard (539 PPM) |
| 2 | Midland | Very Hard (500 PPM) |
| 3 | Bridgeport | Very Hard (457 PPM) |
| 4 | Cypress Mill | Very Hard (443 PPM) |
| 5 | San Angelo | Very Hard (428 PPM) |
| 6 | Henrietta | Very Hard (372 PPM) |
| 7 | Odessa | Very Hard (360 PPM) |
| 8 | Plainview | Very Hard (321 PPM) |
| 9 | Corpus Christi | Very Hard (310 PPM) |
| 10 | Agua Dulce | Very Hard (310 PPM) |
Top 10 Softest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Caldwell | Soft (7 PPM) |
| 2 | Snook | Soft (7 PPM) |
| 3 | Somerville | Soft (7 PPM) |
| 4 | Lake Kiowa | Soft (7 PPM) |
| 5 | Bryan | Soft (8 PPM) |
| 6 | College Station | Soft (8 PPM) |
| 7 | Millican | Soft (8 PPM) |
| 8 | Itasca | Soft (9 PPM) |
| 9 | Big Sandy | Soft (13 PPM) |
| 10 | Laneville | Soft (14 PPM) |
All Cities in Texas
City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.