WI6630259 · Wisconsin

ONTARIO WATERWORKS

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

Violation records shown: 5
EPA health-based flag: 1
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 3

Counties listed by EPA · Vernon County, Wisconsin

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 132.5 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved

Monitoring, Routine (RTCR)Violation 2500032 · Revised Total Coliform Rule · Revised Total Coliform Rule

Noncompliance period start July 1, 2025 · period end July 31, 2025 · first reported December 17, 2025 · EPA return-to-compliance field July 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
2500050	August 18, 2025	Resolving	State Compliance achieved
2500051	August 28, 2025	Informal	State Violation/Reminder Notice
2500052	August 28, 2025	Informal	State Public Notification requested
2600059	June 18, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring and Reporting (DBP)Violation 2600036 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported March 2, 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
2600055	October 28, 2025	Informal	State Violation/Reminder Notice
2600056	October 28, 2025	Informal	State Public Notification requested
2600060	June 18, 2026	Informal	State Public Notification received

Monitoring or reporting · Archived

Monitoring and Reporting (DBP)Violation 2600035 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported March 2, 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
2600055	October 28, 2025	Informal	State Violation/Reminder Notice
2600056	October 28, 2025	Informal	State Public Notification requested
2600060	June 18, 2026	Informal	State Public Notification received

Other or unclassified · Unaddressed by formal action
Public Notification Violation for NPDWR ViolationViolation 2500030 · Public Notice · Public Notice Rule and Revised PN Rule
Noncompliance period start October 17, 2024 · first reported August 28, 2025
No linked action row appears in the records shown.

EPA health-based flag · Resolved

LSL InventoryViolation 2500029 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule Revisions

Noncompliance period start October 17, 2024 · period end June 9, 2025 · first reported August 28, 2025 · EPA return-to-compliance field June 9, 2025

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
2500046	June 9, 2025	Resolving	State Compliance achieved
9999900000000000001	June 18, 2025	Informal	Federal Violation/Reminder Notice

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