GRAND PORTAGE
PWS ID: 055294101 · GRAND PORTAGE, 05 55605
Population Served
820
Total Violations
1,966
Health-Based Violations
78
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 139
- School/Daycare
- No
- MCL Violations
- 11
- Monitoring Violations
- 1,743
- Treatment Tech Violations
- 67
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | MR | 97 | 2023 |
| Public Notice | Other | 89 | 2025 |
| Surface Water Treatment Rule | MR | 55 | 2022 |
| Interim Enhanced Surface Water Treatment Rule | TT | 41 | 2022 |
| Lead and Copper Rule | MR | 35 | 2024 |
| Revised Total Coliform Rule | MON | 29 | 2021 |
| Chlorine | MR | 27 | 2021 |
| Asbestos | MR | 26 | 2023 |
| Arsenic | MR | 25 | 2023 |
| Beryllium, Total | MR | 25 | 2023 |
| Nickel | MR | 25 | 2023 |
| Selenium | MR | 25 | 2023 |
| 2,3,7,8-TCDD | MR | 23 | 2023 |
| Revised Total Coliform Rule | RPT | 23 | 2023 |
| cis-1,2-Dichloroethylene | MR | 22 | 2023 |
| Xylenes, Total | MR | 22 | 2023 |
| Trichloroethylene | MR | 22 | 2023 |
| 1,1,2-Trichloroethane | MR | 22 | 2023 |
| Tetrachloroethylene | MR | 22 | 2023 |
| CHLOROBENZENE | MR | 22 | 2023 |
| Toluene | MR | 22 | 2023 |
| Ethylbenzene | MR | 22 | 2023 |
| Styrene | MR | 22 | 2023 |
| Barium | MR | 22 | 2023 |
| Cadmium | MR | 22 | 2023 |
| Chromium | MR | 22 | 2023 |
| Fluoride | MR | 22 | 2023 |
| Thallium, Total | MR | 22 | 2023 |
| CYANIDE | MR | 22 | 2023 |
| 1,2,4-Trichlorobenzene | MR | 22 | 2023 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.