COUPEVILLE TOWN OF
PWS ID: WA5315550 · Coupeville, Washington 98239
PFAS Detected
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
4,077
Total Violations
104
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,478
- County
- Island
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 94
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 11 | 2007 |
| Nitrate | MR | 10 | 2009 |
| Barium | MR | 4 | 2002 |
| Cadmium | MR | 4 | 2002 |
| Chromium | MR | 4 | 2002 |
| Mercury | MR | 4 | 2002 |
| Fluoride | MR | 4 | 2002 |
| Selenium | MR | 4 | 2002 |
| Antimony, Total | MR | 3 | 2002 |
| Beryllium, Total | MR | 3 | 2002 |
| Thallium, Total | MR | 3 | 2002 |
| CYANIDE | MR | 3 | 2002 |
| Nickel | MR | 3 | 2002 |
| Consumer Confidence Rule | Other | 2 | 2015 |
| Aldicarb sulfone | MR | 2 | 2008 |
| OXAMYL | MR | 2 | 2008 |
| Aldicarb | MR | 2 | 2008 |
| Carbofuran | MR | 2 | 2008 |
| Aldicarb sulfoxide | MR | 2 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2002 |
| cis-1,2-Dichloroethylene | MR | 1 | 2002 |
| o-Dichlorobenzene | MR | 1 | 2002 |
| p-Dichlorobenzene | MR | 1 | 2002 |
| trans-1,2-Dichloroethylene | MR | 1 | 2002 |
| 1,2-Dichloroethane | MR | 1 | 2002 |
| Trichloroethylene | MR | 1 | 2002 |
| Tetrachloroethylene | MR | 1 | 2002 |
| CHLOROBENZENE | MR | 1 | 2002 |
| Benzene | MR | 1 | 2002 |
| Toluene | MR | 1 | 2002 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 9 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| ADONA | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 8/20/2025 | <9 µg/L | 9 µg/L | Not Detected |
| PFHpA | 8/20/2025 | 0.0033 µg/L | 0.003 µg/L | Detected |
| PFTA | 8/20/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFOA | 8/20/2025 | 0.0098 µg/L | 0.004 µg/L | Detected |
| PFDA | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 8/20/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFDoA | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/20/2025 | 0.0170 µg/L | 0.003 µg/L | Detected |
| PFUnA | 8/20/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/20/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBS | 8/20/2025 | 0.0067 µg/L | 0.003 µg/L | Detected |
| HFPO-DA | 8/20/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 8/20/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 8/20/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 8/20/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFHxS | 8/20/2025 | 0.0038 µg/L | 0.003 µg/L | Detected |
| PFNA | 8/20/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/20/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOS | 8/20/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 4:2 FTS | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NEtFOSAA | 8/20/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 8/20/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 8/20/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMBA | 8/20/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 8/20/2025 | 0.0120 µg/L | 0.003 µg/L | Detected |
| PFMPA | 8/20/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeS | 8/20/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| lithium | 7/8/2025 | <9 µg/L | 9 µg/L | Not Detected |
| PFOS | 3/10/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMBA | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 3/10/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 3/10/2025 | 0.0053 µg/L | 0.005 µg/L | Detected |
| HFPO-DA | 3/10/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 3/10/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 3/10/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 3/10/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 3/10/2025 | 0.0059 µg/L | 0.003 µg/L | Detected |
| PFDoA | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 3/10/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 4:2 FTS | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 3/10/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 3/10/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 3/10/2025 | 0.0110 µg/L | 0.003 µg/L | Detected |
| PFMPA | 3/10/2025 | <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.