Public water system record
Oak Lawn
Serves Oak Lawn, Cook County, IL · 58,362 people served
Federal records show no health-based violations and 4 monitoring/reporting issues for Oak Lawn in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 4
Key facts
- Oak Lawn buys its water from Chicago.
- Record on file since 1992, with 2 health-based violations before October 19, 2016.
- Lead pipe inventory: 2,209 lead and 47 unknown out of 17,012 service lines.
Check whether Oak Lawn 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, 2025 | Active |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2022 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2016 | Resolved |
Full record since 1992
EPA's records for Oak Lawn go back to 1992. Before October 19, 2016 they list 2 health-based violations (2 resolved) and 5 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 2 | 1 |
| 2000s | 0 | 1 |
| 2010 to October 18, 2016 | 0 | 3 |
| 2020s | 0 | 3 |
Most recent health-based violation before October 19, 2016: Lead and Copper Rule, began January 1993, Resolved.
Show all 2 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1993 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Dec 7, 1992 | Resolved |
Where the water comes from
Oak Lawn buys its water from Chicago. It lists no wells or intakes of its own. 9 other community water systems and 2 smaller public systems such as schools, businesses or campgrounds buy water from Oak Lawn. 1 other public water system has an emergency connection to Oak Lawn.
Buys water from
- Chicago Chicago, IL
Community systems that buy water from it
- Chicago Ridge Chicago Ridge, IL
- Country Club Hills Country Club Hills, IL
- Matteson Matteson, IL
- Oak Forest Oak Forest, IL
- Olympia Fields Olympia Fields, IL
- Orland Park Orland Park, IL
- Palos Hills Palos Hills, IL
- Palos Park Palos Park, IL
- Tinley Park Tinley Park, IL
Annual water quality report
Oak Lawn 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.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
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