TWIN VALLEY LAKES IMPROVEMENT ASSN
PWS ID: IA5200861 · SOLON, Iowa 52333-9324
Population Served
100
Total Violations
174
Health-Based Violations
65
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 40
- County
- Johnson
- School/Daycare
- No
- MCL Violations
- 65
- Monitoring Violations
- 89
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 65 | 2010 |
| Lead and Copper Rule | MR | 15 | 2020 |
| Mercury | MR | 8 | 1988 |
| Consumer Confidence Rule | Other | 7 | 2022 |
| Chromium | MR | 7 | 1988 |
| Fluoride | MR | 7 | 1988 |
| Gross Alpha, Excl. Radon and U | MR | 7 | 1987 |
| Barium | MR | 7 | 1988 |
| Cadmium | MR | 7 | 1988 |
| Arsenic | MR | 7 | 1988 |
| Selenium | MR | 7 | 1988 |
| Nitrate | MR | 5 | 1985 |
| Revised Total Coliform Rule | MON | 4 | 2019 |
| Coliform (TCR) | MR | 4 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2025 |
| TTHM | MR | 2 | 2025 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.