ILWACO WATER DEPARTMENT CITY OF
PWS ID: WA5335500 · ILWACO, Washington 98624
Population Served
2,757
Total Violations
159
Health-Based Violations
6
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 703
- County
- Pacific
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 152
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 12 | 2007 |
| Lead and Copper Rule | MR | 11 | 2009 |
| Arsenic | MR | 8 | 2007 |
| Barium | MR | 8 | 2007 |
| Cadmium | MR | 8 | 2007 |
| Chromium | MR | 8 | 2007 |
| CYANIDE | MR | 8 | 2007 |
| Fluoride | MR | 8 | 2007 |
| Mercury | MR | 8 | 2007 |
| Beryllium, Total | MR | 8 | 2007 |
| Coliform (TCR) | MR | 8 | 1998 |
| Selenium | MR | 8 | 2007 |
| Nickel | MR | 8 | 2007 |
| Thallium, Total | MR | 8 | 2007 |
| Antimony, Total | MR | 8 | 2007 |
| Surface Water Treatment Rule | TT | 6 | 2005 |
| TTHM | MR | 2 | 2015 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2015 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2007 |
| o-Dichlorobenzene | MR | 1 | 2007 |
| p-Dichlorobenzene | MR | 1 | 2007 |
| Vinyl chloride | MR | 1 | 2007 |
| Carbon tetrachloride | MR | 1 | 2007 |
| Trichloroethylene | MR | 1 | 2007 |
| 1,1,2-Trichloroethane | MR | 1 | 2007 |
| Tetrachloroethylene | MR | 1 | 2007 |
| Benzene | MR | 1 | 2007 |
| Styrene | MR | 1 | 2007 |
| Consumer Confidence Rule | Other | 1 | 2016 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.