AQUARION-GREENWICH
PWS ID: CT0570011 · SHELTON, Connecticut 06484
PFAS Detected
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
53,297
Total Violations
114
Health-Based Violations
5
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 17,060
- County
- Fairfield
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 97
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorite | MR | 8 | 2024 |
| Nitrite | MR | 4 | 1993 |
| Consumer Confidence Rule | Other | 4 | 2018 |
| 1,2,4-Trichlorobenzene | MR | 4 | 2018 |
| cis-1,2-Dichloroethylene | MR | 4 | 2018 |
| o-Dichlorobenzene | MR | 4 | 2018 |
| p-Dichlorobenzene | MR | 4 | 2018 |
| Vinyl chloride | MR | 4 | 2018 |
| 1,1-Dichloroethylene | MR | 4 | 2018 |
| 1,2-Dichloroethane | MR | 4 | 2018 |
| Carbon tetrachloride | MR | 4 | 2018 |
| 1,2-Dichloropropane | MR | 4 | 2018 |
| Trichloroethylene | MR | 4 | 2018 |
| CHLOROBENZENE | MR | 4 | 2018 |
| Toluene | MR | 4 | 2018 |
| CARBON, TOTAL | MR | 4 | 2018 |
| Benzene | MR | 4 | 2018 |
| Interim Enhanced Surface Water Treatment Rule | TT | 4 | 2009 |
| 1,1,2-Trichloroethane | MR | 4 | 2018 |
| Tetrachloroethylene | MR | 4 | 2018 |
| trans-1,2-Dichloroethylene | MR | 4 | 2018 |
| 1,1,1-Trichloroethane | MR | 4 | 2018 |
| Styrene | MR | 4 | 2018 |
| DICHLOROMETHANE | MR | 4 | 2018 |
| Ethylbenzene | MR | 4 | 2018 |
| Fluoride | MCL | 1 | 1979 |
| Lead and Copper Rule | MR | 1 | 2019 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 21 of 360 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| ADONA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 8/6/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFOA | 8/6/2025 | 0.0040 µg/L | 0.004 µg/L | Detected |
| 9Cl-PF3ONS | 8/6/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| HFPO-DA | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFBS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 8/6/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 8/6/2025 | 0.0047 µg/L | 0.004 µg/L | Detected |
| PFDA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 8/6/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 8/6/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/6/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFEESA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 8/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 8/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 8/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 8/6/2025 | <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.