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MT0004507 · Montana

ARROW CREEK TRAILER COURT

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

Violation records shown
37
EPA health-based flag
5
Health-based records unresolved in this snapshot
0
Monitoring and reporting records
26

Counties listed by EPA · Yellowstone 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 35 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 50 days. The interval uses the reporting periods and dates on file.

  1. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2913 · Groundwater Rule · Ground Water Rule

    Noncompliance period start May 1, 2026 · period end May 31, 2026 · first reported August 24, 2026 · EPA return-to-compliance field May 31, 2026

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2628June 19, 2026InformalState Violation/Reminder Notice
    2629June 19, 2026InformalState Public Notification requested
    2631July 10, 2026ResolvingState Compliance achieved

  2. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2912 · Groundwater Rule · Ground Water Rule

    Noncompliance period start March 1, 2026 · period end March 31, 2026 · first reported May 27, 2026 · EPA return-to-compliance field March 31, 2026

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2624April 30, 2026InformalState Violation/Reminder Notice
    2625April 30, 2026InformalState Public Notification requested
    2627July 10, 2026ResolvingState Compliance achieved

  3. EPA health-based flag · Resolved

    Treatment Technique (SWTR and GWR)Violation 2911 · Groundwater Rule · Ground Water Rule

    Noncompliance period start October 1, 2025 · period end October 31, 2025 · first reported January 5, 2026 · EPA return-to-compliance field October 31, 2025

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2620November 26, 2025InformalState Violation/Reminder Notice
    2621November 26, 2025InformalState Public Notification requested
    2623December 10, 2025ResolvingState Compliance achieved

  4. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2910 · Groundwater Rule · Ground Water Rule

    Noncompliance period start September 1, 2025 · period end September 30, 2025 · first reported November 17, 2025 · EPA return-to-compliance field September 30, 2025

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2616October 27, 2025InformalState Violation/Reminder Notice
    2617October 27, 2025InformalState Public Notification requested
    2619December 10, 2025ResolvingState Compliance achieved

  5. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2909 · Groundwater Rule · Ground Water Rule

    Noncompliance period start April 1, 2025 · period end April 30, 2025 · first reported June 23, 2025 · EPA return-to-compliance field April 30, 2025

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2611May 27, 2025InformalState Violation/Reminder Notice
    2612May 27, 2025InformalState Public Notification requested
    2614June 10, 2025ResolvingState Compliance achieved

  6. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2908 · Groundwater Rule · Ground Water Rule

    Noncompliance period start December 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2607January 17, 2025InformalState Violation/Reminder Notice
    2608January 17, 2025InformalState Public Notification requested
    2610February 10, 2025ResolvingState Compliance achieved

  7. Monitoring or reporting · Resolved

    Lead Consumer NoticeViolation 2907 · Lead and Copper Rule · Lead and Copper Rule

    Noncompliance period start October 1, 2024 · period end November 27, 2024 · first reported December 19, 2024 · EPA return-to-compliance field November 27, 2024

    7 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2600November 27, 2024InformalState Violation/Reminder Notice
    2601November 27, 2024InformalState Public Notification requested
    2602November 27, 2024ResolvingState Compliance achieved
    2603November 27, 2024InformalState Violation/Reminder Notice
    2604November 27, 2024ResolvingState Compliance achieved
    2605November 27, 2024InformalState Violation/Reminder Notice
    2606November 27, 2024ResolvingState Compliance achieved

  8. Other or unclassified · Resolved

    Consumer Confidence Report Inadequate ReportingViolation 2906 · Consumer Confidence Rule · Consumer Confidence Rule

    Noncompliance period start October 1, 2023 · period end June 19, 2024 · first reported December 20, 2023 · EPA return-to-compliance field June 19, 2024

    2 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2595October 13, 2023InformalState Violation/Reminder Notice
    2596June 19, 2024ResolvingState Compliance achieved

  9. Monitoring or reporting · Resolved

    Follow-up Or Routine LCR Tap M/RViolation 2905 · Lead and Copper Rule · Lead and Copper Rule

    Noncompliance period start July 1, 2023 · period end December 27, 2023 · first reported September 22, 2023 · EPA return-to-compliance field December 27, 2023

    5 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2594June 14, 2023InformalState Other
    2591July 27, 2023InformalState Violation/Reminder Notice
    2592July 27, 2023InformalState Public Notification requested
    2593December 27, 2023ResolvingState Compliance achieved
    2599March 25, 2024FormalState Administrative/Compliance Order with penalty issued

  10. Other or unclassified · Resolved

    Consumer Confidence Report Complete Failure to ReportViolation 2904 · Consumer Confidence Rule · Consumer Confidence Rule

    Noncompliance period start July 1, 2023 · period end June 19, 2024 · first reported September 22, 2023 · EPA return-to-compliance field June 19, 2024

    2 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2589July 11, 2023InformalState Violation/Reminder Notice
    2590June 19, 2024ResolvingState Compliance achieved

  11. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2896 · Groundwater Rule · Ground Water Rule

    Noncompliance period start April 1, 2023 · period end April 30, 2023 · first reported September 22, 2023 · EPA return-to-compliance field April 30, 2023

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2580May 31, 2023InformalState Violation/Reminder Notice
    2581May 31, 2023InformalState Public Notification requested
    2583June 30, 2023ResolvingState Compliance achieved

  12. EPA health-based flag · Resolved

    Maximum Contaminant Level Violation, Single SampleViolation 2894 · Nitrate-Nitrite · Nitrate Rule

    Noncompliance period start April 1, 2023 · period end June 30, 2023 · first reported September 22, 2023 · EPA return-to-compliance field June 30, 2023

    7 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2573May 1, 2023InformalState Violation/Reminder Notice
    2574May 1, 2023InformalState Public Notification requested
    2584June 5, 2023InformalState Other
    2585June 14, 2023InformalState Other
    2597February 6, 2024InformalState Public Notification received
    2599March 25, 2024FormalState Administrative/Compliance Order with penalty issued
    2575April 28, 2024ResolvingState Compliance achieved

  13. Monitoring or reporting · Resolved

    Initial, Follow-up, or Routine Source Water M/RViolation 2891 · Lead and Copper Rule · Lead and Copper Rule

    Noncompliance period start April 1, 2023 · period end September 26, 2024 · first reported September 22, 2023 · EPA return-to-compliance field September 26, 2024

    6 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2564April 28, 2023InformalState Violation/Reminder Notice
    2565April 28, 2023InformalState Public Notification requested
    2584June 5, 2023InformalState Other
    2585June 14, 2023InformalState Other
    2599March 25, 2024FormalState Administrative/Compliance Order with penalty issued
    2566September 26, 2024ResolvingState Compliance achieved

  14. EPA health-based flag · Resolved

    OCCT/SOWT Study/RecommendationViolation 2890 · Lead and Copper Rule · Lead and Copper Rule

    Noncompliance period start April 1, 2023 · period end September 20, 2024 · first reported September 22, 2023 · EPA return-to-compliance field September 20, 2024

    6 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2561April 28, 2023InformalState Violation/Reminder Notice
    2562April 28, 2023InformalState Public Notification requested
    2584June 5, 2023InformalState Other
    2585June 14, 2023InformalState Other
    2599March 25, 2024FormalState Administrative/Compliance Order with penalty issued
    2563September 20, 2024ResolvingState Compliance achieved

  15. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2895 · Groundwater Rule · Ground Water Rule

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

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2576May 1, 2023InformalState Violation/Reminder Notice
    2577May 1, 2023InformalState Public Notification requested
    2579June 30, 2023ResolvingState Compliance achieved

  16. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2889 · Groundwater Rule · Ground Water Rule

    Noncompliance period start February 1, 2023 · period end February 28, 2023 · first reported September 22, 2023 · EPA return-to-compliance field February 28, 2023

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2557April 6, 2023InformalState Violation/Reminder Notice
    2558April 6, 2023InformalState Public Notification requested
    2560June 30, 2023ResolvingState Compliance achieved

  17. EPA health-based flag · Resolved

    Maximum Contaminant Level Violation, Single SampleViolation 2893 · 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

    6 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2570May 1, 2023InformalState Violation/Reminder Notice
    2571May 1, 2023InformalState Public Notification requested
    2584June 5, 2023InformalState Other
    2585June 14, 2023InformalState Other
    2599March 25, 2024FormalState Administrative/Compliance Order with penalty issued
    2572April 28, 2024ResolvingState Compliance achieved

  18. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2888 · Groundwater Rule · Ground Water Rule

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

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2553March 9, 2023InformalState Violation/Reminder Notice
    2554March 9, 2023InformalState Public Notification requested
    2556June 30, 2023ResolvingState Compliance achieved

  19. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2887 · Groundwater Rule · Ground Water Rule

    Noncompliance period start November 1, 2022 · period end November 30, 2022 · first reported September 22, 2023 · EPA return-to-compliance field November 30, 2022

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2549December 27, 2022InformalState Violation/Reminder Notice
    2550December 27, 2022InformalState Public Notification requested
    2552January 10, 2023ResolvingState Compliance achieved

  20. EPA health-based flag · Resolved

    Public EducationViolation 2892 · Lead and Copper Rule · Lead and Copper Rule

    Noncompliance period start October 16, 2022 · period end April 25, 2024 · first reported September 22, 2023 · EPA return-to-compliance field April 25, 2024

    6 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2567April 28, 2023InformalState Violation/Reminder Notice
    2568April 28, 2023InformalState Public Notification requested
    2584June 5, 2023InformalState Other
    2585June 14, 2023InformalState Other
    2599March 25, 2024FormalState Administrative/Compliance Order with penalty issued
    2569April 25, 2024ResolvingState Compliance achieved

  21. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2886 · Groundwater Rule · Ground Water Rule

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

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2545November 21, 2022InformalState Violation/Reminder Notice
    2546November 21, 2022InformalState Public Notification requested
    2548January 10, 2023ResolvingState Compliance achieved

  22. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2885 · Groundwater Rule · Ground Water Rule

    Noncompliance period start September 1, 2022 · period end September 30, 2022 · first reported September 22, 2023 · EPA return-to-compliance field September 30, 2022

    6 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2537November 1, 2022InformalState Violation/Reminder Notice
    2538November 1, 2022InformalState Public Notification requested
    2541November 1, 2022InformalState Violation/Reminder Notice
    2542November 1, 2022InformalState Public Notification requested
    2540January 10, 2023ResolvingState Compliance achieved
    2544January 10, 2023ResolvingState Compliance achieved

  23. Other or unclassified · Resolved

    Consumer Confidence Report Complete Failure to ReportViolation 2884 · Consumer Confidence Rule · Consumer Confidence Rule

    Noncompliance period start July 1, 2022 · period end July 19, 2022 · first reported September 22, 2023 · EPA return-to-compliance field July 19, 2022

    2 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2535July 11, 2022InformalState Violation/Reminder Notice
    2536July 19, 2022ResolvingState Compliance achieved

  24. Other or unclassified · Resolved

    Consumer Confidence Report Inadequate ReportingViolation 2883 · Consumer Confidence Rule · Consumer Confidence Rule

    Noncompliance period start October 1, 2021 · period end January 1, 2025 · first reported September 22, 2023 · EPA return-to-compliance field January 1, 2025

    2 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2533October 15, 2021InformalState Violation/Reminder Notice
    2534January 1, 2025ResolvingState Compliance achieved

  25. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2882 · Groundwater Rule · Ground Water Rule

    Noncompliance period start August 1, 2021 · period end August 31, 2021 · first reported September 22, 2023 · EPA return-to-compliance field August 31, 2021

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2529September 15, 2021InformalState Violation/Reminder Notice
    2530September 15, 2021InformalState Public Notification requested
    2532September 15, 2021ResolvingState Compliance achieved

  26. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2881 · Groundwater Rule · Ground Water Rule

    Noncompliance period start July 1, 2021 · period end June 17, 2021 · first reported September 22, 2023 · EPA return-to-compliance field June 17, 2021

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2528June 17, 2021ResolvingState Compliance achieved
    2525August 13, 2021InformalState Violation/Reminder Notice
    2526August 13, 2021InformalState Public Notification requested

  27. Other or unclassified · Resolved

    Consumer Confidence Report Complete Failure to ReportViolation 2880 · Consumer Confidence Rule · Consumer Confidence Rule

    Noncompliance period start July 1, 2021 · period end June 17, 2021 · first reported September 22, 2023 · EPA return-to-compliance field June 17, 2021

    2 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2524June 17, 2021ResolvingState Compliance achieved
    2523July 19, 2021InformalState Violation/Reminder Notice

  28. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2879 · Groundwater Rule · Ground Water Rule

    Noncompliance period start June 1, 2021 · period end June 17, 2021 · first reported September 22, 2023 · EPA return-to-compliance field June 17, 2021

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2522June 17, 2021ResolvingState Compliance achieved
    2519July 15, 2021InformalState Violation/Reminder Notice
    2520July 15, 2021InformalState Public Notification requested

  29. Monitoring or reporting · Resolved

    Monitoring of Treatment (SWTR-Unfilt/GWR)Violation 2878 · Groundwater Rule · Ground Water Rule

    Noncompliance period start December 1, 2020 · period end December 31, 2020 · first reported September 22, 2023 · EPA return-to-compliance field December 31, 2020

    3 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2515January 13, 2021InformalState Violation/Reminder Notice
    2516January 13, 2021InformalState Public Notification requested
    2518February 8, 2021ResolvingState Compliance achieved

  30. Other or unclassified · Resolved

    Consumer Confidence Report Inadequate ReportingViolation 2877 · Consumer Confidence Rule · Consumer Confidence Rule

    Noncompliance period start October 1, 2020 · period end November 20, 2020 · first reported September 22, 2023 · EPA return-to-compliance field November 20, 2020

    2 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2513October 27, 2020InformalState Violation/Reminder Notice
    2514November 20, 2020ResolvingState Compliance achieved

  31. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2903 · ETHYLENE DIBROMIDE · Synthetic Organic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState Compliance achieved

  32. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2902 · 1,2-DIBROMO-3-CHLOROPROPANE · Synthetic Organic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState Compliance achieved

  33. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2901 · Total Polychlorinated Biphenyls (PCB) · Synthetic Organic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState Compliance achieved

  34. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2900 · Glyphosate · Synthetic Organic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState Compliance achieved

  35. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2899 · Endothall · Synthetic Organic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState Compliance achieved

  36. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2898 · Diquat · Synthetic Organic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState Compliance achieved

  37. Monitoring or reporting · Resolved

    Monitoring, RegularViolation 2897 · CYANIDE · Inorganic Chemicals

    Noncompliance period start January 1, 2020 · period end December 31, 2022 · first reported August 15, 2023 · EPA return-to-compliance field December 31, 2022

    4 linked actions
    Enforcement and resolution records linked by EPA
    Action IDDateCategoryEPA action type
    2586June 21, 2023InformalState Violation/Reminder Notice
    2587June 21, 2023InformalState Public Notification requested
    2598February 7, 2024InformalState Public Notification received
    2588April 28, 2024ResolvingState 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.

EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility