CITY OF WILLIS
PWS ID: TX1700003 · WILLIS, Texas 77378-9072
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
9,867
Total Violations
49
Health-Based Violations
5
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,289
- County
- Montgomery
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 38
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 8 | 2003 |
| E. COLI | MR | 4 | 2024 |
| Revised Total Coliform Rule | MCL | 4 | 2025 |
| Lead and Copper Rule | MR | 3 | 2024 |
| Public Notice | Other | 2 | 2025 |
| Picloram | MR | 1 | 2021 |
| Carbofuran | MR | 1 | 2021 |
| Dinoseb | MR | 1 | 2021 |
| 2,4,5-TP | MR | 1 | 2021 |
| Antimony, Total | MR | 1 | 2021 |
| CYANIDE | MR | 1 | 2021 |
| Thallium, Total | MR | 1 | 2021 |
| Aldicarb sulfone | MR | 1 | 2021 |
| Aldicarb | MR | 1 | 2021 |
| 2,4-D | MR | 1 | 2021 |
| Arsenic | MR | 1 | 2021 |
| Fluoride | MR | 1 | 2021 |
| Beryllium, Total | MR | 1 | 2021 |
| Barium | MR | 1 | 2021 |
| Coliform (TCR) | MCL | 1 | 1993 |
| Chromium | MR | 1 | 2021 |
| ETHYLENE DIBROMIDE | MR | 1 | 2021 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2021 |
| Dalapon | MR | 1 | 2021 |
| Coliform (TCR) | Other | 1 | 1993 |
| OXAMYL | MR | 1 | 2021 |
| Cadmium | MR | 1 | 2021 |
| Aldicarb sulfoxide | MR | 1 | 2021 |
| Selenium | MR | 1 | 2021 |
| Mercury | MR | 1 | 2021 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 3 of 90 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFNA | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/30/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 6/30/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 6/30/2025 | 162.0000 µg/L | 9 µg/L | Detected |
| PFEESA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 6/30/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 6/30/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 6/30/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFMPA | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMBA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 6/30/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFBS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/30/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHpS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 6/30/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/30/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 6/30/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFOS | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 6/30/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFOA | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 6/30/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 6/30/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
PFAS data from EPA UCMR5 monitoring program (2023-2025).
This data is provided for informational purposes only.