MONTERRA
PWS ID: WA5355990 · SEQUIM, Washington 98382
Population Served
464
Total Violations
25
Health-Based Violations
6
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 192
- County
- Clallam
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 17
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 6 | 2005 |
| Coliform (TCR) | MCL | 6 | 1999 |
| Consumer Confidence Rule | Other | 2 | 2018 |
| Nitrate | MR | 2 | 2014 |
| Arsenic | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Barium | MR | 1 | 1979 |
| Mercury | MR | 1 | 1979 |
| Cadmium | MR | 1 | 1979 |
| Lead and Copper Rule | MR | 1 | 1997 |
| Chromium | MR | 1 | 1979 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Selenium | MR | 1 | 1979 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.