RIO WATERWORKS
PWS ID: WI1110111 · RIO, Wisconsin 53960-0276
Population Served
1,095
Total Violations
69
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 405
- County
- Columbia
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 54
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 20 | 2010 |
| Radium-228 | MR | 8 | 2009 |
| TTHM | MR | 8 | 2014 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2009 |
| Combined Radium (-226 and -228) | MR | 4 | 2009 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2014 |
| Coliform (TCR) | MR | 4 | 1996 |
| Lead and Copper Rule | MR | 2 | 2024 |
| Groundwater Rule | Other | 2 | 2018 |
| Public Notice | Other | 1 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.