Public water system record
Northbrook
Serves Northbrook, Cook County, IL · 34,407 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for Northbrook 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
- 2
Key facts
- Northbrook draws water from 2 surface water intakes.
- Record on file since 1977, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 313 lead and 0 unknown out of 12,509 service lines.
Check whether Northbrook 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 |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 30, 2020 | Resolved |
Full record since 1977
EPA's records for Northbrook go back to 1977. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 2 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 1990s | 1 | 0 |
| 2000s | 0 | 1 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Lead and Copper Rule, began January 1993, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1993 | Resolved |
Where the water comes from
Northbrook draws water from 2 surface water intakes. It also has emergency connections to Glencoe, Highland Park and Glenview. 2 other community water systems and 1 smaller public system such as schools, businesses or campgrounds buy water from Northbrook. 3 other public water systems have emergency connections to Northbrook.
Emergency or part-time connections to
- Glencoe Glencoe, IL
- Highland Park Highland Park, IL
- Glenview Glenview, IL
Community systems that buy water from it
- Mission Brook SD Northbrook, IL
- Riverwoods Vernon Hills, IL
Annual water quality report
Northbrook 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