Texas tap water by county
Hardness, PFAS sampling, lead and violations for the largest water systems in 17 Texas counties. In 17 of them, at least one large system detected PFAS in EPA testing (a detection isn't a violation).
| County | Largest system | Hardness | PFAS detected |
|---|---|---|---|
| Harris County | City of Houston | 7.9 gpg (high) | 5 of 6 systems |
| Dallas County | Dallas Water Utility | 9.3 gpg (low) | 6 of 6 systems |
| Tarrant County | City of Fort Worth | 8.1 gpg (low) | 6 of 6 systems |
| Bexar County | San Antonio Water System | 256.5–342 mg/L (varies) (high) | 1 of 6 systems |
| Travis County | City of Austin Water & Wastewater | 5.4 gpg (high) | 6 of 6 systems |
| Collin County | City of Plano | 7.8 gpg (low) | 6 of 6 systems |
| Denton County | City of Denton | 6.9 gpg (low) | 6 of 6 systems |
| Fort Bend County | City of Sugar Land | 11.1 gpg (low) | 5 of 6 systems |
| Hidalgo County | Mcallen Public Utility | 16.9 gpg (low) | 6 of 6 systems |
| El Paso County | El Paso Water Utilities | 10.2 gpg (high) | 5 of 6 systems |
| Montgomery County | City of Conroe | 4.3 gpg (low) | 2 of 6 systems |
| Williamson County | City of Georgetown | 11.8 gpg (low) | 5 of 6 systems |
| Cameron County | Brownsville Public Utilities Board | 21.4 gpg (low) | 6 of 6 systems |
| Brazoria County | City of Pearland | 11.7 gpg (low) | 5 of 6 systems |
| Bell County | City of Killeen | 11.1 gpg (low) | 6 of 6 systems |
| Galveston County | City of League City | 13.4 gpg (low) | 5 of 6 systems |
| Nueces County | City of Corpus Christi | 32.1 gpg (low) | 5 of 5 systems |
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
Hardness confidence: high = utility report; low = county estimate of untreated local water. Don't see your county? Use the water quality lookup.