ONSTED
PWS ID: MI0005020 · ONSTED, Michigan 49265
Population Served
907
Total Violations
18
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 365
- County
- Lenawee
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 18
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 2011 |
| TTHM | MR | 3 | 2019 |
| Arsenic | MR | 3 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2019 |
| Lead and Copper Rule | MR | 2 | 2024 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.