Public water system record
Oak Brook
Serves Oak Brook, DuPage County, IL · 9,400 people served
Federal records show no health-based violations and 3 monitoring/reporting issues for Oak Brook in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 3
Key facts
- Oak Brook buys its water from Du Page Water Commission.
- Record on file since 1977, with 4 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 3,060 service lines.
Check whether Oak Brook 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.
None since October 2016.
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, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2024 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2023 | Resolved |
Full record since 1977
EPA's records for Oak Brook go back to 1977. Before October 19, 2016 they list 4 health-based violations (3 resolved, 1 archived by EPA without a recorded fix) and 2 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 1980s | 4 | 0 |
| 2000s | 0 | 1 |
| 2020s | 0 | 3 |
Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began October 1989, Resolved.
Show all 4 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 1989 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Dec 1, 1985 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 4, 1985 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Dec 2, 1981 | Archived |
Where the water comes from
Oak Brook buys its water from Du Page Water Commission. EPA also lists 3 wells, all for emergency, seasonal or other part-time use. It also has an emergency connection to Elmhurst. 1 other community water system buys water from Oak Brook. 1 other public water system has an emergency connection to Oak Brook.
Buys water from
- Du Page Water Commission Elmhurst, IL
Emergency or part-time connections to
- Elmhurst Elmhurst, IL
Community systems that buy water from it
- Aqua Illinois-Oak Brook Kankakee, IL
Annual water quality report
Oak Brook 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