ALSEA COUNTY SERVICE DISTRICT
PWS ID: OR4100978 · CORVALLIS, Oregon 97333
Population Served
202
Total Violations
40
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 83
- County
- Benton
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 30
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 2006 |
| Nitrate | MR | 6 | 2011 |
| Consumer Confidence Rule | Other | 3 | 2025 |
| Coliform (TCR) | MCL | 3 | 2007 |
| Arsenic | MR | 2 | 1999 |
| Antimony, Total | MR | 1 | 1999 |
| CYANIDE | MR | 1 | 1999 |
| Thallium, Total | MR | 1 | 1999 |
| Chromium | MR | 1 | 1979 |
| Mercury | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Selenium | MR | 1 | 1979 |
| Beryllium, Total | MR | 1 | 1999 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
| Revised Total Coliform Rule | MON | 1 | 2023 |
| Lead and Copper Rule | MR | 1 | 1994 |
| Cadmium | MR | 1 | 1979 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Barium | MR | 1 | 1979 |
| Nickel | MR | 1 | 1999 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.