Clean Air Act stationary source · ICIS-AIR OK0000004004700134

TARGA PIPELINE MIDCONTINENT WESTOK LLC / HILLSDALE COMPRESSOR STATION, Enid, OK: Clean Air Act compliance record, inspections, violations, penalties

Name: TARGA PIPELINE MIDCONTINENT WESTOK LLC / HILLSDALE COMPRESSOR STATION, ICIS-AIR OK0000004004700134: Clean Air Act stationary source record
Creator: Velarion Records
License: https://www.usa.gov/government-works

OperatingOperating status
Synthetic minor sourceEmissions classification
No Violation IdentifiedCurrent violation status, as filed
22Compliance evaluations since January 1, 2017
0High-priority violations since January 1, 2017
0Formal enforcement actions since January 1, 2017

TARGA PIPELINE MIDCONTINENT WESTOK LLC / HILLSDALE COMPRESSOR STATION, at 0.4 MI W OAKWOOD RD/HOLDEN RD, Enid in Garfield County, Oklahoma, is an operating synthetic minor 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 filed	TARGA PIPELINE MIDCONTINENT WESTOK LLC / HILLSDALE COMPRESSOR STATION
ICIS-AIR ID	OK0000004004700134
EPA facility registry ID	110061076927
Operating status	Operating
Emissions classification	Synthetic minor source
Current violation status (ICIS-AIR high-priority violation field)	No Violation Identified
Address	0.4 MI W OAKWOOD RD/HOLDEN RD, Enid, OK 73753
County	Garfield County
In a nonattainment county	No (EPA Green Book)
Industry (NAICS)	Oil and gas extraction (NAICS 2111)
SIC code	1311
EPA region	06

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 TARGA PIPELINE MIDCONTINENT WESTOK LLC / HILLSDALE COMPRESSOR STATION 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

22Evaluations since January 1, 2017
2Full compliance evaluations

Date	What EPA recorded	Agency	Programs
February 1, 2023	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 26, 2022	FCE On-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 16, 2022	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 7, 2022	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
March 14, 2022	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 25, 2021	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 28, 2021	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 14, 2021	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 16, 2021	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 15, 2021	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 3, 2020	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 22, 2020	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
April 7, 2020	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 26, 2019	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 2, 2019	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
September 12, 2018	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
July 12, 2018	FCE On-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
February 28, 2018	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
February 26, 2018	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
February 15, 2017	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 25, 2017	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
January 11, 2017	PCE Off-Site	State	MACT Standards (40 CFR Part 63); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards

Violations

0Violation 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.

EPA’s violation history file holds no violation for ICIS-AIR OK0000004004700134 since January 1, 2017.

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

EPA’s informal action file holds no notice or warning for ICIS-AIR OK0000004004700134 since January 1, 2017.

Stack tests

18Stack tests since January 1, 2017
0Recorded as failed

Date	What EPA recorded	Agency
July 7, 2025	Pass	State
April 8, 2025	Pass	State
March 4, 2025	Pass	State
May 7, 2024	Pass	State
April 10, 2024	Pass	State
June 6, 2023	Pass	State
May 9, 2023	Pass	State
June 7, 2022	Pass	State
July 13, 2021	Pass	State
July 7, 2020	Pass	State
August 8, 2019	Pass	State
June 6, 2019	Pass	State
September 13, 2018	Pass	State
September 13, 2018	Pass	State
January 3, 2018	Pass	State
January 3, 2018	Pass	State
February 10, 2017	Pass	State
January 6, 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.

Watch this source

One source, $99/month. A source: the register entry for a plant, refinery, kiln, generating station, or other fixed installation the agency tracks under the Clean Air Act. Choose “One source” and enter this source’s ICIS-AIR ID, OK0000004004700134.

Start the watch

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 110061076927 there.

Nearby on the register

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

This page is a Velarion Records public-records register entry for a Clean Air Act stationary source, TARGA PIPELINE MIDCONTINENT WESTOK LLC / HILLSDALE COMPRESSOR STATION in Enid, OK. It lists 22 compliance evaluations since January 1, 2017, 0 high-priority violations since January 1, 2017, and 0 formal enforcement actions since January 1, 2017. The operating status is Operating, the emissions classification is Synthetic minor source, and the current violation status is No Violation Identified.