DOWNINGTOWN WATER AUTHORITY
PWS ID: PA1150026 · DOWNINGTOWN, Pennsylvania 19335
PFAS Detected
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
9,900
Total Violations
248
Health-Based Violations
26
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,681
- County
- Chester
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 199
- Treatment Tech Violations
- 16
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| CARBON, TOTAL | MR | 27 | 2018 |
| Public Notice | Other | 15 | 2014 |
| CARBON, TOTAL | TT | 12 | 2014 |
| Coliform (TCR) | MR | 10 | 2015 |
| Fluoride | MR | 9 | 2014 |
| Surface Water Treatment Rule | MR | 9 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2022 |
| Total Haloacetic Acids (HAA5) | MCL | 7 | 2013 |
| Cadmium | MR | 7 | 2014 |
| TTHM | MR | 6 | 2025 |
| Barium | MR | 5 | 2014 |
| Selenium | MR | 5 | 2014 |
| Antimony, Total | MR | 5 | 2014 |
| Beryllium, Total | MR | 5 | 2014 |
| Thallium, Total | MR | 5 | 2014 |
| Nitrate | MR | 5 | 1994 |
| Nickel | MR | 5 | 2014 |
| Nitrite | MR | 4 | 2013 |
| Chlorine | MR | 4 | 2014 |
| 1,1-Dichloroethylene | MR | 4 | 2023 |
| Carbon tetrachloride | MR | 4 | 2023 |
| Trichloroethylene | MR | 4 | 2023 |
| Benzene | MR | 4 | 2023 |
| Interim Enhanced Surface Water Treatment Rule | MR | 4 | 2025 |
| p-Dichlorobenzene | MR | 4 | 2023 |
| 1,2-Dichloroethane | MR | 4 | 2023 |
| 1,1,1-Trichloroethane | MR | 4 | 2023 |
| Surface Water Treatment Rule | TT | 4 | 1998 |
| Lead and Copper Rule | MR | 4 | 2013 |
| Chromium | MR | 3 | 2014 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 120 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFMPA | 7/8/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFEESA | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 7/8/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBS | 7/8/2024 | 0.0037 µg/L | 0.003 µg/L | Detected |
| PFHpA | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 7/8/2024 | 0.0034 µg/L | 0.003 µg/L | Detected |
| PFNA | 7/8/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 7/8/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 7/8/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 7/8/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 7/8/2024 | 0.0031 µg/L | 0.003 µg/L | Detected |
| 4:2 FTS | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 7/8/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFOA | 7/8/2024 | 0.0042 µg/L | 0.004 µg/L | Detected |
| PFTrDA | 7/8/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| 6:2 FTS | 7/8/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/8/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFTA | 7/8/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NEtFOSAA | 7/8/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 7/8/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/8/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 7/8/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 7/8/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 7/8/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 7/8/2024 | <9 µg/L | 9 µg/L | Not Detected |
| NEtFOSAA | 4/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 4/24/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 4/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 4/24/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFMBA | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 4/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 4/24/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| HFPO-DA | 4/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 4/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 4/24/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 4/24/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 4/24/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 4/24/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 4/24/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFNA | 4/24/2024 | <0.004 µg/L | 0.004 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.