OAK KNOLL WINERY
PWS ID: OR4105229 · HILLSBORO, Oregon 97123
Population Served
50
Total Violations
17
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- Private
- Connections
- 2
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 13
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 11 | 2003 |
| Coliform (TCR) | MCL | 3 | 2011 |
| Nitrate | MR | 2 | 2001 |
| Public Notice | Other | 1 | 2011 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.