MT0005118 · Montana

STILL RIVER ESTATES SUBDIVISION

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

Violation records shown: 26
EPA health-based flag: 1
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 25

Counties listed by EPA · Yellowstone County, Montana

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

Violations and what followed

Among 25 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 364 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved

Monitoring, RegularViolation 37 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start May 1, 2026 · period end May 31, 2026 · first reported June 29, 2026 · EPA return-to-compliance field May 31, 2026

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
30	March 13, 2023	Informal	State Other
29	June 7, 2023	Formal	State Administrative/Compliance Order without penalty issued
28	June 3, 2026	Resolving	State Compliance achieved
26	June 10, 2026	Informal	State Violation/Reminder Notice
27	June 10, 2026	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring, RegularViolation 36 · Styrene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 35 · Ethylbenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 34 · Toluene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 33 · Benzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 32 · CHLOROBENZENE · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 31 · Tetrachloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 30 · 1,1,2-Trichloroethane · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 29 · Trichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 28 · 1,2-Dichloropropane · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 27 · Carbon tetrachloride · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 26 · 1,1,1-Trichloroethane · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 25 · 1,2-Dichloroethane · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 24 · trans-1,2-Dichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 23 · 1,1-Dichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 22 · Vinyl chloride · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 21 · p-Dichlorobenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 20 · o-Dichlorobenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 19 · DICHLOROMETHANE · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 18 · Xylenes, Total · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 17 · cis-1,2-Dichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 16 · 1,2,4-Trichlorobenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 25, 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 8, 2026	Resolving	State Compliance achieved
22	January 24, 2026	Informal	State Violation/Reminder Notice
23	January 24, 2026	Informal	State Public Notification requested
25	February 12, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Initial Tap Sampling for Pb and CuViolation 15 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start January 1, 2025 · period end June 25, 2025 · first reported March 24, 2025 · EPA return-to-compliance field June 25, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
19	February 4, 2025	Informal	State Violation/Reminder Notice
20	February 4, 2025	Informal	State Public Notification requested
21	June 25, 2025	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Initial Tap Sampling for Pb and CuViolation 14 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start July 1, 2023 · period end June 6, 2024 · first reported September 22, 2023 · EPA return-to-compliance field June 6, 2024

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
16	July 27, 2023	Informal	State Violation/Reminder Notice
17	July 27, 2023	Informal	State Public Notification requested
18	June 6, 2024	Resolving	State Compliance achieved

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 13 · Nitrate-Nitrite · Nitrate Rule

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

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
11	February 21, 2023	Informal	State Violation/Reminder Notice
12	February 21, 2023	Informal	State Public Notification requested
14	March 13, 2023	Informal	State Other
15	June 7, 2023	Formal	State Administrative/Compliance Order without penalty issued

Monitoring or reporting · Resolved

Monitoring, RegularViolation 2 · Nitrate-Nitrite · Nitrate Rule

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

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
5	January 18, 2023	Informal	State Violation/Reminder Notice
6	January 18, 2023	Informal	State Public Notification requested
7	February 1, 2023	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