Public water system record
Blackhawk Estates LLC
Serves an area of Cook County, IL · 1,238 people served
Federal records show 1 health-based violation and 10 monitoring/reporting issues for Blackhawk Estates LLC in the last ten years. The most serious issue in this window was a resolved Combined Radium (-226 and -228) violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 10
Key facts
- Blackhawk Estates LLC draws water from 2 wells.
- Highest measured level in the last 10 years: Combined Radium (-226 and -228), 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit), 2024.
- Most recent formal enforcement: signed compliance agreement by Illinois, January 2005.
- Record on file since 1981, with 14 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 502 service lines.
Check whether Blackhawk Estates LLC serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
340 | Apr 1, 2024 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Active |
|
Public Notice
OTHER
|
Jun 8, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Mar 1, 2023 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Oct 1, 2022 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Jul 1, 2022 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Oct 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Nov 1, 2017 | Resolved |
|
Chlorine
Monitoring and reporting
|
Oct 1, 2017 | Resolved |
Full record since 1981
EPA's records for Blackhawk Estates LLC go back to 1981. Before October 19, 2016 they list 14 health-based violations (14 resolved) and 11 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 1 |
| 1990s | 0 | 1 |
| 2000s | 14 | 2 |
| 2010 to October 18, 2016 | 0 | 7 |
| October 19, 2016 to 2019 | 0 | 2 |
| 2020s | 1 | 8 |
Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began October 2005, Resolved.
Show all 14 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2005 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Apr 1, 2005 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Jan 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2003 | Resolved |
Enforcement actions
Illinois regulators took 2 formal enforcement actions against Blackhawk Estates LLC between 2004 and 2005. The most recent was a signed compliance agreement in January 2005.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jan 19, 2005 | Illinois | Signed compliance agreement | 2 violations (2 health-based): Gross Alpha, Excl. Radon and U |
| Mar 23, 2004 | Illinois | Signed compliance agreement | 12 violations (12 health-based): Combined Radium (-226 and -228) |
What the violations mean
Combined Radium (-226 and -228)
1 incidentTest results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about this violation.
Where the water comes from
Blackhawk Estates LLC draws water from 2 wells.
Annual water quality report
Blackhawk Estates LLC must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Illinois.
Certified drinking water labs by state EPA guidance for private wells