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Clean Air Act stationary source · ICIS-AIR WY0000005602500005

CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC), Evansville, WY: Clean Air Act compliance record, inspections, violations, penalties

CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC), at 5700 EAST HIGHWAY 20-26, Evansville in Natrona County, Wyoming, 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 “Addressed-State”. 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 filedCASPER REFINERY (HF SINCLAIR CASPER REFINING LLC)
ICIS-AIR IDWY0000005602500005
EPA facility registry ID110011942719
Operating statusOperating
Emissions classificationMajor source
Current violation status (ICIS-AIR high-priority violation field)Addressed-State
Address5700 EAST HIGHWAY 20-26, Evansville, WY 82636
CountyNatrona County
In a nonattainment countyNo (EPA Green Book)
Industry (NAICS)Petroleum and coal products manufacturing (NAICS 3241)
SIC code2911
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 CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) 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
August 27, 2025FCE On-SiteStateMACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
September 28, 2023FCE On-SiteStateTitle V Permits
September 14, 2022FCE On-SiteStateTitle V Permits
August 26, 2020FCE On-SiteStateTitle V Permits
August 29, 2018FCE On-SiteStateTitle V Permits
August 30, 2017FCE On-SiteStateTitle 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.

EPA’s violation history file holds no violation for ICIS-AIR WY0000005602500005 since January 1, 2017.

Enforcement and penalties

1 formal enforcement actions since January 1, 2017, 1 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.

DateWhat EPA recordedAgencyPenalty, as filed
June 13, 2018Civil Judicial ActionState$31,500

Informal enforcement

EPA’s informal action file holds no notice or warning for ICIS-AIR WY0000005602500005 since January 1, 2017.

Stack tests

DateWhat EPA recordedAgency
November 25, 2025PassState
November 25, 2025PassState
November 24, 2025PassState
October 17, 2025PassState
October 16, 2025PassState
October 8, 2025FailState
October 7, 2025FailState
February 10, 2025PassState
February 10, 2025PassState
February 10, 2025PassState
December 17, 2024PassState
December 17, 2024PassState
October 9, 2024PassState
October 9, 2024PassState
October 9, 2024PassState
October 9, 2024PassState
September 11, 2024PassState
December 4, 2023PassState
November 2, 2023PassState
October 31, 2023PassState
September 11, 2023PassState
September 11, 2023PassState
September 11, 2023PassState
December 13, 2022PassState
November 11, 2022PassState
October 18, 2022FailState
October 17, 2022PassState
September 20, 2022PassState
August 25, 2022PendingState
February 18, 2022PassState
January 28, 2022PassState
July 13, 2021PassState
September 26, 2020PassState
September 22, 2020PassState
September 4, 2020PassState
December 26, 2019PassState
December 4, 2019PassState
September 17, 2019PassState
February 21, 2019PassState
January 16, 2019PassState
December 12, 2018PassState
May 10, 2018PassState
March 23, 2018PassState
March 23, 2018PassState
February 21, 2018PassState
December 28, 2017PassState
October 5, 2017PassState
October 2, 2017PassState
June 2, 2017PassState
January 18, 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 110011942719 there.

Nearby on the register

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