Clean Air Act stationary source · ICIS-AIR MT0000003008700007
COLSTRIP ENERGY LTD PARTNERSHIP, Colstrip, MT: Clean Air Act compliance record, inspections, violations, penalties
- OperatingOperating status
- Major sourceEmissions classification
- No Violation IdentifiedCurrent violation status, as filed
- 4Compliance evaluations since January 1, 2017
- 0High-priority violations since January 1, 2017
- 0Formal enforcement actions since January 1, 2017
COLSTRIP ENERGY LTD PARTNERSHIP, at ROSEBUD PLANT, Colstrip in Rosebud County, Montana, is an operating major source of air pollution on EPA’s ICIS-AIR register. EPA’s file records its current violation status (ICIS-AIR’s high-priority violation field) as “No Violation Identified”. Rosebud County is on EPA’s Green Book list of areas that do not meet a national air quality standard. The status and classification are as EPA’s facility file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the source’s current standing, quarter by quarter.
Identity
| Facility as filed | COLSTRIP ENERGY LTD PARTNERSHIP |
|---|---|
| ICIS-AIR ID | MT0000003008700007 |
| EPA facility registry ID | 110041886144 |
| Operating status | Operating |
| Emissions classification | Major source |
| Current violation status (ICIS-AIR high-priority violation field) | No Violation Identified |
| Address | ROSEBUD PLANT, Colstrip, MT 59323 |
| County | Rosebud County |
| In a nonattainment county | Yes (EPA Green Book) |
| Industry (NAICS) | Utilities (NAICS 2211) |
| EPA region | 08 |
Cited to the EPA ICIS-AIR facility file (ECHO download).
Programs and pollutants
Velarion’s copy of EPA’s ICIS-AIR download does not include its program, pollutant and Title V certification files, so this page does not list the Clean Air Act programs COLSTRIP ENERGY LTD PARTNERSHIP is under or the pollutants it is permitted for. The programs each evaluation and violation below was recorded under are shown with it. EPA’s free Detailed Facility Report lists both.
Compliance evaluations
- 4Evaluations since January 1, 2017
- 4Full compliance evaluations
| Date | What EPA recorded | Agency | Programs |
|---|---|---|---|
| July 24, 2026 | FCE On-Site | State | MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| September 11, 2024 | FCE On-Site | State | MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| July 29, 2022 | FCE On-Site | State | MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| July 24, 2020 | FCE On-Site | State | MACT Standards (40 CFR Part 63); New Source Performance Standards; Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
Violations
- 1Violation determinations since January 1, 2017
- 0Of them high-priority
A high-priority violation (HPV) is the most serious class of Clean Air Act non-compliance an agency records; a federally reportable violation (FRV) is the next step down. Each row is one determination as EPA’s violation history files it.
| Date | What EPA recorded | Agency | Programs |
|---|---|---|---|
| July 21, 2017 | Earliest FRV determination | State | MACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
Enforcement and penalties
0 formal enforcement actions since January 1, 2017, 0 of them with a penalty filed above zero. Each penalty is shown as EPA’s formal action file states it; “Not stated” means the file gives no figure, and $0 is a disclosed zero.
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| September 12, 2024 | Notice of Violation | State |
| February 6, 2018 | Warning Letter | State |
Stack tests
- 33Stack tests since January 1, 2017
- 0Recorded as failed
| Date | What EPA recorded | Agency |
|---|---|---|
| January 13, 2026 | Pass | State |
| January 13, 2026 | Pass | State |
| January 13, 2026 | Pass | State |
| December 20, 2024 | Pass | State |
| December 20, 2024 | Pass | State |
| December 20, 2024 | Pass | State |
| March 4, 2024 | Pass | State |
| December 15, 2023 | Pass | State |
| December 15, 2023 | Pass | State |
| December 15, 2023 | Pass | State |
| December 15, 2023 | Pass | State |
| January 23, 2023 | Pass | State |
| January 23, 2022 | Pass | State |
| November 18, 2021 | Pass | State |
| November 18, 2021 | Pass | State |
| January 28, 2021 | Pass | State |
| December 19, 2019 | Pass | State |
| January 29, 2019 | Pass | State |
| February 21, 2018 | Pass | State |
| February 21, 2018 | Pass | State |
| February 21, 2018 | Pass | State |
| February 21, 2018 | Pass | State |
| February 21, 2018 | Pass | State |
| February 21, 2018 | Pass | State |
| July 21, 2017 | Pass | State |
| July 21, 2017 | Pass | State |
| July 21, 2017 | Pass | State |
| April 18, 2017 | Pass | State |
| April 18, 2017 | Pass | State |
| April 17, 2017 | Pass | State |
| January 17, 2017 | Pass | State |
| January 17, 2017 | Pass | State |
| January 17, 2017 | Pass | State |
Cited to the EPA ICIS-AIR evaluation, violation, stack test and enforcement files (ECHO download), events dated January 1, 2017 or later as loaded; up to 50 rows of each shown, newest first.
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How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every source on ECHO: its compliance status quarter by quarter, its evaluations, and its violations, enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter EPA facility registry ID 110041886144 there.
Nearby on the register
- Air-emissions sources in Rosebud County
- Every source record in Rosebud County, A to Z
- Air-emissions sources in Montana
- Every source record in Montana, A to Z
Figures from EPA’s ICIS-AIR download, loaded September 14, 2026.