KEYSTONE WATER SUPPLY
PWS ID: IA0640030 · KEYSTONE, Iowa 52249
Population Served
599
Total Violations
142
Health-Based Violations
25
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 280
- County
- Benton
- School/Daycare
- No
- MCL Violations
- 23
- Monitoring Violations
- 78
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrite | MR | 25 | 2015 |
| Nitrite | MCL | 23 | 2021 |
| Nitrate | MR | 20 | 2018 |
| Toluene | MR | 8 | 2013 |
| Coliform (TCR) | MR | 8 | 2013 |
| Lead and Copper Rule | MR | 4 | 2018 |
| Public Notice | Other | 4 | 2013 |
| Groundwater Rule | TT | 2 | 2021 |
| Barium | MR | 2 | 1988 |
| Chromium | MR | 2 | 1988 |
| Selenium | MR | 2 | 1988 |
| Cadmium | MR | 2 | 1988 |
| Arsenic | MR | 2 | 1988 |
| Fluoride | MR | 2 | 1988 |
| Mercury | MR | 1 | 1988 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.