083090079 · Montana
ROCKY BOY AGENCY WATER SYSTEM
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 24
- EPA health-based flag
- 0
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 24
Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.
Violations and what followed
Among 24 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 20078 · Styrene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20077 · Ethylbenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20076 · Toluene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20075 · Benzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20074 · CHLOROBENZENE · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20073 · Tetrachloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20072 · 1,1,2-Trichloroethane · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20071 · Trichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20070 · 1,2-Dichloropropane · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20069 · Carbon tetrachloride · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20068 · 1,1,1-Trichloroethane · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20067 · 1,2-Dichloroethane · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20066 · trans-1,2-Dichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20065 · 1,1-Dichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20064 · Vinyl chloride · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20063 · p-Dichlorobenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20062 · o-Dichlorobenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20061 · DICHLOROMETHANE · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20060 · Xylenes, Total · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20059 · cis-1,2-Dichloroethylene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20058 · 1,2,4-Trichlorobenzene · Volatile Organic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported June 29, 2026 · EPA return-to-compliance field December 31, 2025
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1454 March 11, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 20036 · Asbestos · Inorganic ChemicalsNoncompliance period start January 1, 2023 · period end March 31, 2023 · first reported September 11, 2023 · EPA return-to-compliance field March 31, 2023
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1449 August 3, 2023 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 19985 · Asbestos · Inorganic ChemicalsNoncompliance period start October 1, 2022 · period end December 31, 2022 · first reported June 26, 2023 · EPA return-to-compliance field December 31, 2022
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1449 August 3, 2023 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 19984 · Asbestos · Inorganic ChemicalsNoncompliance period start July 1, 2022 · period end September 30, 2022 · first reported February 16, 2023 · EPA return-to-compliance field September 30, 2022
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1449 August 3, 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