MI0004170 · Michigan

MASON, CITY OF

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

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

Counties listed by EPA · Ingham County, Michigan

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

Violations and what followed

Among 5 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 152 days. The interval uses the reporting periods and dates on file.

Other or unclassified · Resolved

Consumer Confidence Report Inadequate ReportingViolation 4000417 · Consumer Confidence Rule · Consumer Confidence Rule

Noncompliance period start July 1, 2023 · period end November 30, 2023 · first reported December 5, 2023 · EPA return-to-compliance field November 30, 2023

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4001735	November 2, 2023	Informal	State Violation/Reminder Notice
4001736	November 30, 2023	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 4000416 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start January 1, 2023 · period end December 31, 2023 · first reported December 5, 2023 · EPA return-to-compliance field December 31, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4001731	October 5, 2023	Informal	State Violation/Reminder Notice
4001732	October 5, 2023	Informal	State Public Notification requested
4001734	August 1, 2024	Informal	State Public Notification received
4001733	September 4, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 4000415 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start January 1, 2023 · period end December 31, 2023 · first reported December 5, 2023 · EPA return-to-compliance field December 31, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4001731	October 5, 2023	Informal	State Violation/Reminder Notice
4001732	October 5, 2023	Informal	State Public Notification requested
4001734	August 1, 2024	Informal	State Public Notification received
4001733	September 4, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, RegularViolation 4000409 · Combined Radium (-226 and -228) · Radionuclides and Revised Rad Rule

Noncompliance period start January 1, 2022 · period end March 31, 2022 · first reported May 31, 2022 · EPA return-to-compliance field March 31, 2022

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4001725	May 4, 2022	Resolving	State Compliance achieved
4001723	May 26, 2022	Informal	State Violation/Reminder Notice
4001724	May 26, 2022	Informal	State Public Notification requested
4001726	December 1, 2022	Informal	State Public Notification received

Other or unclassified · Resolved

Consumer Confidence Report Complete Failure to ReportViolation 4000406 · Consumer Confidence Rule · Consumer Confidence Rule

Noncompliance period start July 1, 2021 · period end August 6, 2021 · first reported December 1, 2021 · EPA return-to-compliance field August 6, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4001718	August 6, 2021	Resolving	State Compliance achieved
4001717	November 30, 2021	Informal	State 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