MT0000046 · Montana
RYAN DAM WATER SYSTEM
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 4
- EPA health-based flag
- 1
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 3
Counties listed by EPA · Cascade 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 2 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 8.5 days. The interval uses the reporting periods and dates on file.
EPA health-based flag · Resolved
Treatment Technique, Level 1 Assessment (RTCR)Violation 4119338 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start May 24, 2023 · period end June 5, 2023 · first reported September 22, 2023 · EPA return-to-compliance field June 5, 2023
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 5383865 June 5, 2023 Resolving State Compliance achieved 5383862 June 19, 2023 Informal State Violation/Reminder Notice 5383863 June 19, 2023 Informal State Public Notification requested Monitoring or reporting · Resolved
Monitoring, Source Water (GWR)Violation 4119337 · E. COLI · Ground Water RuleNoncompliance period start April 20, 2023 · period end April 25, 2023 · first reported September 22, 2023 · EPA return-to-compliance field April 25, 2023
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 5383861 April 25, 2023 Resolving State Compliance achieved 5383858 June 8, 2023 Informal State Violation/Reminder Notice 5383859 June 8, 2023 Informal State Public Notification requested 5383860 June 19, 2023 Informal State Public Notification received Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 4119341 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported November 17, 2025 · 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 5383870 October 22, 2025 Informal State Violation/Reminder Notice 5383871 October 22, 2025 Informal State Public Notification requested 5383873 November 5, 2025 Informal State Public Notification received Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 4119340 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported November 17, 2025 · 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 5383870 October 22, 2025 Informal State Violation/Reminder Notice 5383871 October 22, 2025 Informal State Public Notification requested 5383873 November 5, 2025 Informal State Public Notification received
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