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MT0000180 · Montana

COLSTRIP CITY OF

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

Violation records shown: 8
EPA health-based flag: 2
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 6

Counties listed by EPA · Rosebud County, Montana

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 8 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 30 days. The interval uses the reporting periods and dates on file.

EPA health-based flag · Resolved

Maximum Contaminant Level Violation, AverageViolation 980621 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start July 1, 2024 · period end September 30, 2024 · first reported February 18, 2025 · EPA return-to-compliance field September 30, 2024

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557539	December 20, 2024	Informal	State Violation/Reminder Notice
5557540	December 20, 2024	Informal	State Public Notification requested
5557541	December 20, 2024	Resolving	State Compliance achieved

EPA health-based flag · Resolved

Treatment Technique (SWTR and GWR)Violation 980620 · Surface Water Treatment Rule · Surface Water Treatment Rule

Noncompliance period start July 1, 2024 · period end July 31, 2024 · first reported September 19, 2024 · EPA return-to-compliance field July 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557535	August 23, 2024	Informal	State Violation/Reminder Notice
5557536	August 23, 2024	Informal	State Public Notification requested
5557537	August 23, 2024	Informal	State Public Notification received
5557538	August 23, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring of Treatment (SWTR-Filter)Violation 980619 · Surface Water Treatment Rule · Surface Water Treatment Rule

Noncompliance period start January 1, 2024 · period end January 31, 2024 · first reported March 20, 2024 · EPA return-to-compliance field January 31, 2024

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557523	March 12, 2024	Informal	State Violation/Reminder Notice
5557524	March 12, 2024	Informal	State Public Notification requested
5557526	March 12, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring of Treatment (SWTR-Filter)Violation 980618 · Surface Water Treatment Rule · Surface Water Treatment Rule

Noncompliance period start January 1, 2024 · period end January 31, 2024 · first reported March 20, 2024 · EPA return-to-compliance field January 31, 2024

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557527	March 12, 2024	Informal	State Violation/Reminder Notice
5557528	March 12, 2024	Informal	State Public Notification requested
5557530	March 12, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring of Treatment (SWTR-Filter)Violation 980617 · Surface Water Treatment Rule · Surface Water Treatment Rule

Noncompliance period start January 1, 2024 · period end January 31, 2024 · first reported March 20, 2024 · EPA return-to-compliance field January 31, 2024

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557531	March 12, 2024	Informal	State Violation/Reminder Notice
5557532	March 12, 2024	Informal	State Public Notification requested
5557534	March 12, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 980616 · 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 15, 2023 · EPA return-to-compliance field September 30, 2023

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557520	October 18, 2023	Informal	State Violation/Reminder Notice
5557521	October 18, 2023	Informal	State Public Notification requested
5557522	December 13, 2023	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 980615 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start July 1, 2023 · period end September 30, 2023 · first reported November 15, 2023 · EPA return-to-compliance field September 30, 2023

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557520	October 18, 2023	Informal	State Violation/Reminder Notice
5557521	October 18, 2023	Informal	State Public Notification requested
5557522	December 13, 2023	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, Routine (RTCR)Violation 980614 · Revised Total Coliform Rule · Revised Total Coliform Rule

Noncompliance period start May 1, 2022 · period end May 31, 2022 · first reported September 22, 2023 · EPA return-to-compliance field May 31, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5557519	June 23, 2022	Resolving	State Compliance achieved
5557516	July 8, 2022	Informal	State Violation/Reminder Notice
5557517	July 8, 2022	Informal	State Public Notification requested

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