Velarion Records

Clean Air Act stationary source · ICIS-AIR MT0000003000300018

ROCKY MOUNTAIN POWER, Hardin, MT: Clean Air Act compliance record, inspections, violations, penalties

ROCKY MOUNTAIN POWER, at SUGAR FACTORY RD, Hardin in Big Horn 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”. 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 filedROCKY MOUNTAIN POWER
ICIS-AIR IDMT0000003000300018
EPA facility registry ID110038363623
Operating statusOperating
Emissions classificationMajor source
Current violation status (ICIS-AIR high-priority violation field)No Violation Identified
AddressSUGAR FACTORY RD, Hardin, MT 59034
CountyBig Horn County
In a nonattainment countyNo (EPA Green Book)
Industry (NAICS)Utilities (NAICS 2211)
EPA region08

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 ROCKY MOUNTAIN POWER 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

DateWhat EPA recordedAgencyPrograms
June 2, 2025FCE On-SiteStateAcid Rain Deposition Control (CAA Title IV); MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
June 23, 2023FCE On-SiteStateAcid Rain Deposition Control (CAA Title IV); MACT Standards (40 CFR Part 63); Prevention of Significant Deterioration of Air Quality; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
February 3, 2023PCE Off-SiteStateAcid Rain Deposition Control (CAA Title IV); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
August 5, 2021FCE On-SiteStateAcid Rain Deposition Control (CAA Title IV); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
June 4, 2020PCE Off-SiteStateAcid Rain Deposition Control (CAA Title IV); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
September 25, 2019PCE On-SiteStateAcid Rain Deposition Control (CAA Title IV); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
October 30, 2018PCE Off-SiteStateAcid Rain Deposition Control (CAA Title IV); 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
April 19, 2018FCE On-SiteStateAcid Rain Deposition Control (CAA Title IV); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits

Violations

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.

DateWhat EPA recordedAgencyPrograms
November 28, 2018Earliest FRV determinationStateAcid Rain Deposition Control (CAA Title IV); MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
October 30, 2018Earliest FRV determinationStateAcid Rain Deposition Control (CAA Title IV); 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

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

DateWhat EPA recordedAgency
March 11, 2019Warning LetterState
January 16, 2019Warning LetterState

Stack tests

The newest 50 of 52.

DateWhat EPA recordedAgency
March 3, 2025PassState
January 14, 2025PassState
January 13, 2025PassState
December 2, 2024FailState
October 24, 2024PassState
October 24, 2024PassState
October 18, 2024PassState
October 18, 2024PassState
September 6, 2024FailState
September 6, 2024FailState
December 26, 2023PassState
November 28, 2023PassState
October 12, 2023PassState
October 9, 2023PassState
October 9, 2023PassState
October 6, 2023PassState
August 21, 2023PassState
April 24, 2023PassState
February 21, 2023FailState
January 30, 2023PassState
January 19, 2023PassState
January 19, 2023PassState
January 9, 2023PassState
January 9, 2023PassState
October 17, 2022PassState
September 21, 2022FailState
April 6, 2022PassState
January 27, 2022PassState
January 18, 2022PassState
October 8, 2021PassState
October 8, 2021PassState
October 8, 2021PassState
July 22, 2021PassState
July 1, 2021PassState
April 19, 2021PassState
January 21, 2021PassState
January 12, 2021PassState
September 29, 2020PassState
September 29, 2020PassState
November 8, 2019PassState
January 24, 2019PassState
January 24, 2019FailState
November 11, 2018PassState
November 5, 2018PassState
November 5, 2018PassState
November 5, 2018PassState
September 6, 2018PassState
December 22, 2017PassState
December 22, 2017PassState
December 22, 2017PassState

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 110038363623 there.

Nearby on the register

Figures from EPA’s ICIS-AIR download, loaded September 14, 2026.

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