Public water system record
Maple Park
Serves Maple Park, Kane County and DeKalb County, IL · 1,484 people served
Federal records show 2 health-based violations and 11 monitoring/reporting issues for Maple Park in the last ten years. The most serious issue in this window was a Combined Radium (-226 and -228) violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 2
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 2
- Any acute record
- No
- Monitoring issues, last 10 years
- 11
Key facts
- Maple Park draws water from 2 wells.
- Highest measured level in the last 10 years: Combined Radium (-226 and -228), 11.47 pCi/L, federal limit 5 pCi/L (2.3 times the limit), 2025.
- Most recent formal enforcement: signed compliance agreement by Illinois, December 2009.
- Record on file since 1977, with 16 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 257 unknown out of 591 service lines.
Check whether Maple Park 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 11 pCi/L, federal limit 5 pCi/L (2.2 times the limit)
|
340 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 11.47 pCi/L, federal limit 5 pCi/L (2.3 times the limit)
|
340 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Sep 19, 2025 | Resolved |
|
Public Notice
OTHER
|
Sep 19, 2025 | Resolved |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Jul 2, 2025 | Active |
|
Combined Radium (-226 and -228)
Monitoring and reporting
|
Oct 1, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2021 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
Full record since 1977
EPA's records for Maple Park go back to 1977. Before October 19, 2016 they list 16 health-based violations (13 resolved, 3 archived by EPA without a recorded fix) and 16 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 1990s | 4 | 10 |
| 2000s | 8 | 3 |
| 2010 to October 18, 2016 | 4 | 2 |
| October 19, 2016 to 2019 | 0 | 2 |
| 2020s | 2 | 9 |
Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began April 2014, Resolved.
Show all 16 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 10 pCi/L, federal limit 5 pCi/L (2 times the limit)
|
Apr 1, 2014 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7 pCi/L, federal limit 5 pCi/L (1.4 times the limit)
|
Jan 1, 2014 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7 pCi/L, federal limit 5 pCi/L (1.4 times the limit)
|
Oct 1, 2013 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 8 pCi/L, federal limit 5 pCi/L (1.6 times the limit)
|
Jul 1, 2013 | 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 |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2002 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2002 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1996 | Archived |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Dec 1, 1996 | Archived |
|
Barium
Contaminant limit exceeded
|
Mar 19, 1990 | Archived |
Enforcement actions
Illinois regulators took 4 formal enforcement actions against Maple Park between 1990 and 2009. The most recent was a signed compliance agreement in December 2009.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Dec 16, 2009 | Illinois | Signed compliance agreement | 2 violations: Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Apr 1, 2004 | Illinois | Signed compliance agreement | 9 violations (9 health-based): Combined Radium (-226 and -228) |
| Oct 12, 2001 | Illinois | Signed compliance agreement | 4 violations (4 health-based): Combined Radium (-226 and -228) |
| Oct 11, 1990 | Illinois | Compliance order (no penalty) | 1 violation (1 health-based): Barium |
What the violations mean
Combined Radium (-226 and -228)
2 incidentsTest results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Maple Park draws water from 2 wells.
Annual water quality report
Maple Park 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