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MT0002873 · Montana

MOUNTAIN HERITAGE WATER SYSTEM

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

Violation records shown: 11
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 11

Counties listed by EPA · Lewis and Clark 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 11 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 859 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654765 · Selenium · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654764 · Thallium, Total · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654763 · Beryllium, Total · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654762 · Antimony, Total · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654761 · Nickel · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654760 · Mercury · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654759 · Fluoride · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654758 · Chromium · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654757 · Cadmium · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 654756 · Barium · Inorganic Chemicals

Noncompliance period start January 1, 2020 · period end May 9, 2022 · first reported May 15, 2023 · EPA return-to-compliance field May 9, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505633	May 9, 2022	Resolving	State Compliance achieved
4505631	January 29, 2023	Informal	State Violation/Reminder Notice
4505632	January 29, 2023	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Lead Consumer NoticeViolation 654755 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start April 1, 2019 · period end February 25, 2021 · first reported June 21, 2019 · EPA return-to-compliance field February 25, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
4505629	April 15, 2019	Informal	State Violation/Reminder Notice
4505630	February 25, 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