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IL0434670 · Illinois

NAPERVILLE

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

Violation records shown: 16
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 16

Counties listed by EPA · DuPage County, Illinois

Open the EPA system record

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

Violations and what followed

Among 4 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 1,095 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 7023531 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start April 1, 2023 · period end June 30, 2023 · first reported August 29, 2023 · EPA return-to-compliance field June 30, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4	July 11, 2023	Informal	State Violation/Reminder Notice
5	July 11, 2023	Informal	State Public Notification requested
6	September 8, 2023	Resolving	State Compliance achieved
7	June 6, 2024	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023556 · Di(2-ethylhexyl) adipate · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
40	January 16, 2026	Informal	State Violation/Reminder Notice
41	January 16, 2026	Informal	State Public Notification requested
53	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023555 · BHC-GAMMA · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
38	January 16, 2026	Informal	State Violation/Reminder Notice
39	January 16, 2026	Informal	State Public Notification requested
55	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023554 · Di(2-ethylhexyl) phthalate · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
36	January 16, 2026	Informal	State Violation/Reminder Notice
37	January 16, 2026	Informal	State Public Notification requested
52	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 7023553 · Benzo(a)pyrene · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
34	January 16, 2026	Informal	State Violation/Reminder Notice
35	January 16, 2026	Informal	State Public Notification requested
42	March 13, 2026	Resolving	State Compliance achieved
56	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023552 · HEXACHLOROBENZENE · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
32	January 16, 2026	Informal	State Violation/Reminder Notice
33	January 16, 2026	Informal	State Public Notification requested
59	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023551 · LASSO · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
30	January 16, 2026	Informal	State Violation/Reminder Notice
31	January 16, 2026	Informal	State Public Notification requested
48	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 7023550 · Toxaphene · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
28	January 16, 2026	Informal	State Violation/Reminder Notice
29	January 16, 2026	Informal	State Public Notification requested
42	March 13, 2026	Resolving	State Compliance achieved
44	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023549 · Atrazine · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
26	January 16, 2026	Informal	State Violation/Reminder Notice
27	January 16, 2026	Informal	State Public Notification requested
57	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 7023548 · Chlordane · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
24	January 16, 2026	Informal	State Violation/Reminder Notice
25	January 16, 2026	Informal	State Public Notification requested
42	March 13, 2026	Resolving	State Compliance achieved
54	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023547 · Heptachlor epoxide · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
22	January 16, 2026	Informal	State Violation/Reminder Notice
23	January 16, 2026	Informal	State Public Notification requested
58	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023546 · Methoxychlor · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
20	January 16, 2026	Informal	State Violation/Reminder Notice
21	January 16, 2026	Informal	State Public Notification requested
47	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023545 · Hexachlorocyclopentadiene · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
18	January 16, 2026	Informal	State Violation/Reminder Notice
19	January 16, 2026	Informal	State Public Notification requested
49	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023544 · Endrin · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
16	January 16, 2026	Informal	State Violation/Reminder Notice
17	January 16, 2026	Informal	State Public Notification requested
43	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023543 · Simazine · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
14	January 16, 2026	Informal	State Violation/Reminder Notice
15	January 16, 2026	Informal	State Public Notification requested
46	June 11, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring, RegularViolation 7023542 · Heptachlor · Synthetic Organic Chemicals

Noncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 26, 2026 · EPA return-to-compliance field December 31, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
12	January 16, 2026	Informal	State Violation/Reminder Notice
13	January 16, 2026	Informal	State Public Notification requested
50	June 11, 2026	Informal	State Public Notification received

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