BLACKHAWK ESTATES LLC
PWS ID: IL0317765 · CHICAGO, Illinois 60631
Population Served
1,238
Total Violations
152
Health-Based Violations
89
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 495
- County
- Cook
- School/Daycare
- No
- MCL Violations
- 89
- Monitoring Violations
- 49
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Radium (-226 and -228) | MCL | 77 | 2024 |
| Combined Radium (-226 and -228) | MR | 15 | 2022 |
| Chlorine | MR | 12 | 2023 |
| Gross Alpha, Excl. Radon and U | MCL | 12 | 2005 |
| Revised Total Coliform Rule | MON | 8 | 2023 |
| Consumer Confidence Rule | Other | 5 | 2025 |
| Nitrate | MR | 4 | 2010 |
| Public Notice | Other | 4 | 2024 |
| Lead and Copper Rule | MR | 4 | 2013 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2004 |
| Coliform (TCR) | MR | 2 | 1999 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.