USFWS TUALATIN RIVER NATL WLR
PWS ID: OR4195363 · SHERWOOD, Oregon 97140
Population Served
275
Total Violations
18
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- Federal
- Connections
- 1
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 16
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 6 | 2022 |
| Coliform (TCR) | MR | 5 | 2014 |
| Nitrate | MR | 5 | 2019 |
| Coliform (TCR) | MCL | 1 | 2008 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.