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ICIS-AIR OK0000004005100715

IRON HORSE MIDSTREAM LLC / SILVER PIGEON COMPRESSOR STATION, Ninnekah, OK: Clean Air Act compliance record, inspections, violations, penalties

IRON HORSE MIDSTREAM LLC / SILVER PIGEON COMPRESSOR STATION is on EPA’s ICIS-AIR register at 0.5 MI W OF N2870 RD/OLD FRED RD, Ninnekah in Grady County, Oklahoma: operating status operating, emissions classification synthetic minor source, current violation status “No Violation Identified”.

What stands out

  • The newest of the 50 events on file is a formal enforcement action dated October 17, 2025.
  • Its events on file run from July 9, 2019 through October 17, 2025.
  • Of the 1 formal enforcement action on file, 1 carries a filed penalty above zero. The largest on file is $12,000, filed October 17, 2025.
  • Of its 13 compliance evaluations on file, 1 is a full compliance evaluation.
  • 1 of the 2 violation determinations on file is high-priority.
  • The register holds 1,007 air-emissions sources in Grady County, Oklahoma.

Every line is computed by formula from the record’s stored figures; nothing is estimated.

Identity

Facility as filedIRON HORSE MIDSTREAM LLC / SILVER PIGEON COMPRESSOR STATION
ICIS-AIR IDOK0000004005100715
EPA facility registry ID110070566682
Operating statusOperating
Emissions classificationSynthetic minor source
Current violation status (HPV field)No Violation Identified
Address0.5 MI W OF N2870 RD/OLD FRED RD, Ninnekah, OK 73018
CountyGrady County
In a nonattainment countyNo (EPA Green Book)
Industry (NAICS)Oil and gas extraction (NAICS 2111)
SIC code1311
EPA region06

Programs and pollutants

The program, pollutant and Title V files are not loaded: what this page covers.

Compliance evaluations

DateWhat EPA recordedAgencyPrograms
July 17, 2024FCE On-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 25, 2023PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
December 19, 2022PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
May 6, 2022PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
February 9, 2022PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
February 2, 2022PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
November 10, 2021PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 7, 2021PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 25, 2021PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 22, 2020PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 20, 2020PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 11, 2019PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 9, 2019PCE Off-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards

Violations

What high-priority and federally reportable violations mean.

DateWhat EPA recordedAgencyPrograms
August 22, 2025Earliest FRV determinationStateNew Source Performance Standards
August 29, 2024HPV day-zero determinationStateNew Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards

Enforcement and penalties

1 of the formal enforcement actions carry a penalty filed above zero. How a penalty is shown.

DateWhat EPA recordedAgencyPenalty, as filed
October 17, 2025Administrative OrderState$12,000

Informal enforcement

DateWhat EPA recordedAgency
September 6, 2024Notice of ViolationState

Stack tests

DateWhat EPA recordedAgency
March 22, 2025PassState
March 20, 2025PassState
March 20, 2025PassState
March 20, 2025PassState
March 17, 2025PassState
February 5, 2025PassState
June 13, 2024PassState
March 27, 2024PassState
March 26, 2024PassState
March 26, 2024PassState
March 26, 2024PassState
February 5, 2024PassState
December 11, 2023PassState
May 16, 2023PassState
May 16, 2023PassState
May 16, 2023PassState
May 15, 2023PassState
February 2, 2023PassState
December 13, 2022PassState
May 18, 2022PassState
May 18, 2022PassState
May 18, 2022PassState
May 18, 2022PassState
December 28, 2021PassState
May 18, 2021PassState
May 18, 2021PassState
May 18, 2021PassState
August 20, 2020PassState
August 20, 2020PassState
August 20, 2020PassState
August 30, 2019PassState
August 29, 2019PassState
August 29, 2019PassState

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Other air sources in Oklahoma beside IRON HORSE MIDSTREAM LLC / SILVER PIGEON COMPRESSOR STATION

EPA ICIS-AIR download, loaded September 14, 2026.