IL0431100 · Illinois
WILLOWBROOK
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 8
- EPA health-based flag
- 0
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 4
Counties listed by EPA · DuPage 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 6 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 91 days. The interval uses the reporting periods and dates on file.
Monitoring or reporting · Unaddressed by formal action
Notification, Known or Potential LSLViolation 7119193 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule RevisionsNoncompliance period start July 2, 2025 · first reported November 21, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839308 July 3, 2025 Informal State Violation/Reminder Notice 9839309 July 3, 2025 Informal State Public Notification requested Other or unclassified · Unaddressed by formal action
Consumer Confidence Report Inadequate ReportingViolation 7119194 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2025 · first reported November 21, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839311 September 6, 2025 Informal State Violation/Reminder Notice Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 7119190 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2024 · period end December 31, 2024 · first reported February 27, 2025 · EPA return-to-compliance field December 31, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839303 January 14, 2025 Informal State Violation/Reminder Notice 9839304 January 14, 2025 Informal State Public Notification requested 9839305 April 2, 2025 Resolving State Compliance achieved 9839310 August 26, 2025 Informal State Public Notification received Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 7119189 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2024 · period end December 31, 2024 · first reported February 27, 2025 · EPA return-to-compliance field December 31, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839303 January 14, 2025 Informal State Violation/Reminder Notice 9839304 January 14, 2025 Informal State Public Notification requested 9839305 April 2, 2025 Resolving State Compliance achieved 9839310 August 26, 2025 Informal State Public Notification received Other or unclassified · Resolved
Consumer Confidence Report Inadequate ReportingViolation 7119188 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2023 · period end February 5, 2024 · first reported February 14, 2024 · EPA return-to-compliance field February 5, 2024
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839300 December 14, 2023 Informal State Violation/Reminder Notice 9839302 February 5, 2024 Resolving State Compliance achieved Other or unclassified · Resolved
Consumer Confidence Report Inadequate ReportingViolation 7119186 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2022 · period end February 5, 2024 · first reported November 10, 2022 · EPA return-to-compliance field February 5, 2024
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839299 July 27, 2022 Informal State Violation/Reminder Notice 9839302 February 5, 2024 Resolving State Compliance achieved Other or unclassified · Resolved
Consumer Confidence Report Complete Failure to ReportViolation 7119185 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2021 · period end August 2, 2021 · first reported December 1, 2021 · EPA return-to-compliance field August 2, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839297 July 22, 2021 Informal State Violation/Reminder Notice 9839298 August 2, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Lead Consumer NoticeViolation 7119184 · Lead and Copper Rule · Lead and Copper RuleNoncompliance period start December 30, 2020 · period end January 14, 2021 · first reported March 11, 2021 · EPA return-to-compliance field January 14, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9839295 January 6, 2021 Informal State Violation/Reminder Notice 9839296 January 14, 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