WOLSBORN FARMS WATER DISTRICT
PWS ID: OR4100381 · HILLSBORO, Oregon 97123
Population Served
90
Total Violations
84
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 32
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 70
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 10 | 2025 |
| Coliform (TCR) | MR | 9 | 2016 |
| Revised Total Coliform Rule | MON | 7 | 2017 |
| COLIPHAGE | MR | 6 | 2022 |
| Ethylbenzene | MR | 6 | 2018 |
| Xylenes, Total | MR | 6 | 2018 |
| Lead and Copper Rule | TT | 4 | 2000 |
| Lead and Copper Rule | MR | 2 | 1994 |
| Nitrate | MR | 1 | 2016 |
| Endrin | MR | 1 | 2014 |
| BHC-GAMMA | MR | 1 | 2014 |
| Methoxychlor | MR | 1 | 2014 |
| Dalapon | MR | 1 | 2014 |
| Diquat | MR | 1 | 2014 |
| Endothall | MR | 1 | 2014 |
| Glyphosate | MR | 1 | 2014 |
| Picloram | MR | 1 | 2014 |
| Hexachlorocyclopentadiene | MR | 1 | 2014 |
| Carbofuran | MR | 1 | 2014 |
| Heptachlor | MR | 1 | 2014 |
| 2,4-D | MR | 1 | 2014 |
| HEXACHLOROBENZENE | MR | 1 | 2014 |
| Benzo(a)pyrene | MR | 1 | 2014 |
| Pentachlorophenol | MR | 1 | 2014 |
| ETHYLENE DIBROMIDE | MR | 1 | 2014 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2014 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2014 |
| Chlordane | MR | 1 | 2014 |
| TTHM | MR | 1 | 2014 |
| Simazine | MR | 1 | 2014 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.