1,154 public water systems in Texas were sampled in EPA's UCMR 5 programme (2023–2025); we show six PFAS and lithium. Read 2026-10-31.
103 of 1,154 systems had at least one sample above a 2024 federal limit; 958 had at least one PFAS found above the reporting level; 196 had none found above the reporting level.
A single sample above a 2024 limit is a measurement, not a violation. Compliance is judged on running yearly averages, and water systems have until 2029 to meet the limits. On 20 May 2026 EPA proposed giving qualifying systems until 2031 for PFOA and PFOS and removing the limits for PFHxS, PFNA and HFPO-DA; those proposals were not final when we last checked (5 Nov 2026). Counts are per system, not per person; population figures are available only for systems serving more than 25,000 people (about 22,374,552 people across those systems here). UCMR 5 was a one-time national monitoring programme (2023–2025). The results are a snapshot at the system's entry points or taps on the sample dates, not a continuous measurement and not a compliance record.
| System | People served | UCMR 5 result |
|---|---|---|
| Houston City of Houston, Tx | 2,970,543 | None detected (below the reporting level) |
| San Antonio San Antonio Water System | 2,643,729 | Detected, below the 2024 limit |
| Dallas Dallas Water Utility | 1,356,479 | Above the 2024 limit in at least one sample |
| Austin City of Austin Water & Wastewater | 1,115,323 | Above the 2024 limit in at least one sample |
| Fort Worth City of Fort Worth | 955,900 | Above the 2024 limit in at least one sample |
| El Paso El Paso Water Utilities Public Service B | 747,168 | Above the 2024 limit in at least one sample |
| Arlington City of Arlington | 413,955 | Above the 2024 limit in at least one sample |
Pages for these are being added in stages. The data for all 1,154 systems is in the public dataset.
| System | People served | UCMR 5 result |
|---|---|---|
| City of Corpus Christi City of Corpus Christi | 317,247 | None detected (below the reporting level) |
| City of Plano City of Plano | 292,059 | Detected, below the 2024 limit |
| Lubbock Public Water System Lubbock Public Water System | 266,450 | None detected (below the reporting level) |
| City of Irving City of Irving | 264,546 | Above the 2024 limit in at least one sample |
| City of Laredo City of Laredo | 260,046 | None detected (below the reporting level) |
| City of Garland City of Garland | 248,822 | Detected, below the 2024 limit |
| City of Frisco City of Frisco | 231,910 | Detected, below the 2024 limit |
| City of Mckinney City of Mckinney | 224,043 | None detected (below the reporting level) |
| City of Grand Prairie City of Grand Prairie | 201,843 | Above the 2024 limit in at least one sample |
| Amarillo Municipal Water System Amarillo Municipal Water System | 201,291 | None detected (below the reporting level) |
| Brownsville Public Utilities Board Brownsville Public Utilities Board | 201,249 | Above the 2024 limit in at least one sample |
| City of Georgetown City of Georgetown | 191,639 | Above the 2024 limit in at least one sample |
| North Alamo Wsc North Alamo Wsc | 171,195 | Detected, below the 2024 limit |
| City of Killeen City of Killeen | 161,027 | Detected, below the 2024 limit |
| City of Mesquite City of Mesquite | 158,412 | Detected, below the 2024 limit |
| City of Midland Water Purification Plant City of Midland Water Purification Plant | 157,000 | Above the 2024 limit in at least one sample |
| City of Pasadena City of Pasadena | 152,000 | Above the 2024 limit in at least one sample |
| City of Denton City of Denton | 150,037 | Detected, below the 2024 limit |
| City of League City City of League City | 149,557 | Above the 2024 limit in at least one sample |
| City of Waco City of Waco | 146,241 | None detected (below the reporting level) |
| Mcallen Public Utility Mcallen Public Utility | 145,050 | None detected (below the reporting level) |
| City of Lewisville City of Lewisville | 140,880 | Detected, below the 2024 limit |
| City of Carrollton City of Carrollton | 136,170 | Detected, below the 2024 limit |
| City of Round Rock City of Round Rock | 130,662 | Detected, below the 2024 limit |
| City of Abilene City of Abilene | 130,501 | Above the 2024 limit in at least one sample |