COMBINED WATER SYSTEM
PWS ID: WA5305795 · Coupeville, Washington 98239
Population Served
435
Total Violations
62
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 187
- County
- Island
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 59
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 10 | 2022 |
| Consumer Confidence Rule | Other | 3 | 2025 |
| Arsenic | MR | 3 | 2020 |
| Lead and Copper Rule | MR | 2 | 2019 |
| Pentachlorophenol | MR | 2 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2002 |
| DICHLOROMETHANE | MR | 1 | 2002 |
| o-Dichlorobenzene | MR | 1 | 2002 |
| p-Dichlorobenzene | MR | 1 | 2002 |
| Vinyl chloride | MR | 1 | 2002 |
| 1,1,2-Trichloroethane | MR | 1 | 2002 |
| Tetrachloroethylene | MR | 1 | 2002 |
| CHLOROBENZENE | MR | 1 | 2002 |
| Benzene | MR | 1 | 2002 |
| Toluene | MR | 1 | 2002 |
| Ethylbenzene | MR | 1 | 2002 |
| Styrene | MR | 1 | 2002 |
| Endrin | MR | 1 | 2008 |
| BHC-GAMMA | MR | 1 | 2008 |
| Methoxychlor | MR | 1 | 2008 |
| Simazine | MR | 1 | 2008 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2008 |
| Hexachlorocyclopentadiene | MR | 1 | 2008 |
| Atrazine | MR | 1 | 2008 |
| LASSO | MR | 1 | 2008 |
| Dalapon | MR | 1 | 2008 |
| Picloram | MR | 1 | 2008 |
| Dinoseb | MR | 1 | 2008 |
| TTHM | MR | 1 | 2021 |
| Coliform (TCR) | MR | 1 | 1998 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.