WILLIAMSON COUNTY WSID 3
PWS ID: TX2460152 · AUSTIN, Texas 78701-2744
PFAS Detected
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
8,265
Total Violations
33
Health-Based Violations
8
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 2,755
- County
- Williamson
- School/Daycare
- No
- MCL Violations
- 8
- Monitoring Violations
- 21
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 20 | 2019 |
| Coliform (TCR) | MCL | 8 | 2014 |
| Public Notice | Other | 4 | 2020 |
| Nitrate | MR | 1 | 2011 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 5 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFPeA | 8/18/2025 | 0.0031 µg/L | 0.003 µg/L | Detected |
| PFBA | 8/18/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 8/18/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 8/18/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 8/18/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| HFPO-DA | 8/18/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 8/18/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 8/18/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMBA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 8/18/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 8/18/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTA | 8/18/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFHxS | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 8/18/2025 | 35.5000 µg/L | 9 µg/L | Detected |
| PFBS | 8/18/2025 | 0.0035 µg/L | 0.003 µg/L | Detected |
| NEtFOSAA | 8/18/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 8/18/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 8/18/2025 | 0.0050 µg/L | 0.004 µg/L | Detected |
| PFOA | 8/18/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/18/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFDoA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 8/18/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/18/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 8/18/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 2/17/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 2/17/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 2/17/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 2/17/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 2/17/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 2/17/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 2/17/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFEESA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 2/17/2025 | 71.8000 µg/L | 9 µg/L | Detected |
| PFMBA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 2/17/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 2/17/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 2/17/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 2/17/2025 | <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.