CO0130100 · Colorado

MOUNTAIN WSD

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

Violation records shown: 7
EPA health-based flag: 3
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 3

Counties listed by EPA · Jefferson County, Colorado

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

Violations and what followed

Among 5 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 30 days. The interval uses the reporting periods and dates on file.

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 9141 · Gross Alpha, Excl. Radon and U · Radionuclides and Revised Rad Rule

Noncompliance period start April 1, 2026 · period end June 30, 2026 · first reported May 27, 2026 · EPA return-to-compliance field June 30, 2026

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3489	May 11, 2026	Informal	State Violation/Reminder Notice
3490	May 11, 2026	Informal	State Public Notification requested
3491	May 21, 2026	Informal	State Public Notification received

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 9140 · Gross Alpha, Excl. Radon and U · Radionuclides and Revised Rad Rule

Noncompliance period start January 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 ID	Date	Category	EPA action type
3486	March 9, 2026	Informal	State Violation/Reminder Notice
3487	March 9, 2026	Informal	State Public Notification requested
3488	April 8, 2026	Informal	State Public Notification received

Other or unclassified · Resolved

Consumer Confidence Report Complete Failure to ReportViolation 9139 · Consumer Confidence Rule · Consumer Confidence Rule

Noncompliance period start July 1, 2025 · period end July 15, 2025 · first reported August 18, 2025 · EPA return-to-compliance field July 15, 2025

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3483	July 14, 2025	Informal	State Violation/Reminder Notice
3484	July 14, 2025	Informal	State Public Notification requested
3485	July 15, 2025	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, Turbidity (Enhanced SWTR)Violation 9138 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment Rule

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

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3480	November 12, 2024	Resolving	State Compliance achieved
3481	November 14, 2024	Informal	State Violation/Reminder Notice
3482	November 14, 2024	Informal	State Public Notification requested

Monitoring or reporting · Resolved

Monitoring of Treatment (SWTR-Filter)Violation 9137 · Surface Water Treatment Rule · Surface Water Treatment Rule

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

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3480	November 12, 2024	Resolving	State Compliance achieved
3478	November 14, 2024	Informal	State Violation/Reminder Notice
3479	November 14, 2024	Informal	State Public Notification requested

EPA health-based flag · Resolved

Monthly Turbidity Exceed (Enhanced SWTR)Violation 9136 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment Rule

Noncompliance period start May 1, 2024 · period end May 31, 2024 · first reported August 14, 2024 · EPA return-to-compliance field May 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3474	June 25, 2024	Informal	State Violation/Reminder Notice
3475	June 25, 2024	Informal	State Public Notification requested
3477	July 10, 2024	Resolving	State Compliance achieved
3476	July 24, 2024	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring of Treatment (SWTR-Filter)Violation 9134 · Surface Water Treatment Rule · Surface Water Treatment Rule

Noncompliance period start December 1, 2020 · period end December 31, 2020 · first reported February 16, 2021 · EPA return-to-compliance field December 31, 2020

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3468	January 19, 2021	Informal	State Violation/Reminder Notice
3469	January 19, 2021	Informal	State Public Notification requested
3470	February 9, 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