KNOLL TERRACE PARK
PWS ID: OR4100174 · CORVALLIS, Oregon 97330
Population Served
452
Total Violations
94
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 210
- County
- Benton
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 63
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 8 | 2025 |
| COLIPHAGE | MR | 4 | 2012 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1996 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2002 |
| Xylenes, Total | MR | 1 | 2002 |
| p-Dichlorobenzene | MR | 1 | 2002 |
| trans-1,2-Dichloroethylene | MR | 1 | 2002 |
| 1,2-Dichloroethane | MR | 1 | 2002 |
| 1,2-Dichloropropane | MR | 1 | 2002 |
| Trichloroethylene | MR | 1 | 2002 |
| 1,1,2-Trichloroethane | MR | 1 | 2002 |
| Tetrachloroethylene | MR | 1 | 2002 |
| Benzene | MR | 1 | 2002 |
| Toluene | MR | 1 | 2002 |
| Styrene | MR | 1 | 2002 |
| Methoxychlor | MR | 1 | 2002 |
| Toxaphene | MR | 1 | 2002 |
| Dalapon | MR | 1 | 2002 |
| Glyphosate | MR | 1 | 2002 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2002 |
| OXAMYL | MR | 1 | 2002 |
| Simazine | MR | 1 | 2002 |
| Picloram | MR | 1 | 2002 |
| Hexachlorocyclopentadiene | MR | 1 | 2002 |
| Benzo(a)pyrene | MR | 1 | 2002 |
| Pentachlorophenol | MR | 1 | 2002 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2002 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2002 |
| ETHYLENE DIBROMIDE | MR | 1 | 2002 |
| Chlordane | MR | 1 | 2002 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.