ONAWA KOA
PWS ID: IA6739434 · ONAWA, Iowa 51040
Population Served
250
Total Violations
42
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- Private
- Connections
- 100
- County
- Monona
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 32
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 16 | 2010 |
| Nitrate | MR | 10 | 1988 |
| Revised Total Coliform Rule | MON | 6 | 2021 |
| Revised Total Coliform Rule | TT | 4 | 2024 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.