IL0312070 · Illinois

NORTHBROOK

Federal fiscal 2026Q3 · EPA violation and follow-up records

Violation records shown: 4
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 4

Counties listed by EPA · Cook County, Illinois

Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.

Violations and what followed

Among 2 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 53.5 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Archived
Monitoring, RegularViolation 7014525 · Diquat · Synthetic Organic Chemicals
Noncompliance period start April 1, 2026 · period end June 30, 2026 · first reported August 27, 2026 · EPA return-to-compliance field June 30, 2026
No linked action row appears in the records shown.
Monitoring or reporting · Archived
Monitoring, RegularViolation 7014524 · Endothall · Synthetic Organic Chemicals
Noncompliance period start April 1, 2026 · period end June 30, 2026 · first reported August 27, 2026 · EPA return-to-compliance field June 30, 2026
No linked action row appears in the records shown.

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 7014510 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start July 1, 2023 · period end September 30, 2023 · first reported November 28, 2023 · EPA return-to-compliance field September 30, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
2639613	October 11, 2023	Informal	State Violation/Reminder Notice
2639614	October 11, 2023	Informal	State Public Notification requested
2639615	November 28, 2023	Resolving	State Compliance achieved
2639616	May 13, 2024	Informal	State Public Notification received

Monitoring or reporting · Resolved

Lead Consumer NoticeViolation 7014509 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start December 30, 2020 · period end January 15, 2021 · first reported March 11, 2021 · EPA return-to-compliance field January 15, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
2639611	January 6, 2021	Informal	State Violation/Reminder Notice
2639612	January 15, 2021	Resolving	State Compliance achieved

EPA data and scope

How to read the records

The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.

We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.

EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility