ANNEX CHARTER SCHOOL
PWS ID: OR4190889 · ONTARIO, Oregon 97914
Population Served
50
Total Violations
160
Health-Based Violations
92
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- Malheur
- School/Daycare
- Yes
- MCL Violations
- 91
- Monitoring Violations
- 34
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 39 | 2017 |
| Coliform (TCR) | MCL | 33 | 2013 |
| Public Notice | Other | 29 | 2016 |
| Di(2-ethylhexyl) phthalate | MCL | 17 | 2012 |
| Arsenic | MR | 14 | 2024 |
| Coliform (TCR) | MR | 9 | 2013 |
| Revised Total Coliform Rule | MON | 3 | 2022 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2012 |
| Nitrate | MCL | 2 | 1994 |
| CYANIDE | MR | 1 | 1996 |
| Nitrite | MR | 1 | 1996 |
| OXAMYL | MR | 1 | 2005 |
| Lead and Copper Rule | TT | 1 | 2002 |
| COLIPHAGE | MR | 1 | 2022 |
| Nitrate | MR | 1 | 2023 |
| Lead and Copper Rule | MR | 1 | 1994 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.