Clean Air Act stationary source · ICIS-AIR CT0000000900709105
ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION, Cromwell, CT: Clean Air Act compliance record, inspections, violations, penalties
- OperatingOperating status
- Major sourceEmissions classification
- No Violation IdentifiedCurrent violation status, as filed
- 8Compliance evaluations since January 1, 2017
- 3High-priority violations since January 1, 2017
- 2Formal enforcement actions since January 1, 2017
ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION, at 252 SHUNPIKE RD, Cromwell in Middlesex County, Connecticut, 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”. Middlesex 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 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION |
|---|---|
| ICIS-AIR ID | CT0000000900709105 |
| EPA facility registry ID | 110000851267 |
| Operating status | Operating |
| Emissions classification | Major source |
| Current violation status (ICIS-AIR high-priority violation field) | No Violation Identified |
| Address | 252 SHUNPIKE RD, Cromwell, CT 06416 |
| County | Middlesex County |
| In a nonattainment county | Yes (EPA Green Book) |
| Industry (NAICS) | Pipeline transportation (NAICS 4862) |
| SIC code | 4922 |
| EPA region | 01 |
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 ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL 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
- 8Evaluations since January 1, 2017
- 5Full compliance evaluations
| Date | What EPA recorded | Agency | Programs |
|---|---|---|---|
| July 22, 2025 | FCE On-Site | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| May 15, 2023 | FCE On-Site | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| September 9, 2021 | FCE On-Site | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| November 21, 2019 | PCE Off-Site | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards |
| May 15, 2019 | PCE Off-Site | State | New Source Review Permit Requirements; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| February 13, 2019 | FCE On-Site | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| November 21, 2017 | PCE Off-Site | State | MACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards |
| March 1, 2017 | FCE On-Site | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
Violations
- 3Violation determinations since January 1, 2017
- 3Of 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 |
|---|---|---|---|
| December 5, 2019 | HPV day-zero determination | State | State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards |
| July 1, 2019 | HPV day-zero determination | State | New Source Review Permit Requirements; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits |
| December 6, 2017 | HPV day-zero determination | State | MACT Standards (40 CFR Part 63); State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards |
Enforcement and penalties
2 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.
| Date | What EPA recorded | Agency | Penalty, as filed |
|---|---|---|---|
| September 2, 2021 | Administrative Order | State | $193,460 |
| March 27, 2018 | Administrative Order | State | $0 |
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| December 5, 2019 | Notice of Violation | State |
| July 1, 2019 | Notice of Violation | State |
| July 1, 2019 | Notice of Violation | State |
| July 1, 2019 | Notice of Violation | State |
| December 6, 2017 | Notice of Violation | State |
Stack tests
- 21Stack tests since January 1, 2017
- 0Recorded as failed
| Date | What EPA recorded | Agency |
|---|---|---|
| December 2, 2025 | Pass | State |
| December 2, 2025 | Pass | State |
| July 1, 2025 | Pass | State |
| April 16, 2025 | Pass | State |
| December 4, 2024 | Pass | State |
| December 3, 2024 | Pass | State |
| November 28, 2023 | Pass | State |
| November 28, 2023 | Pass | State |
| May 31, 2023 | Pass | State |
| May 3, 2022 | Pass | State |
| November 16, 2021 | Pass | State |
| November 16, 2021 | Pass | State |
| November 16, 2021 | Pass | State |
| October 6, 2021 | Pass | State |
| April 29, 2021 | Pass | State |
| January 21, 2020 | Pass | State |
| December 12, 2019 | Pass | State |
| December 11, 2019 | Pass | State |
| December 9, 2019 | Pass | State |
| June 5, 2019 | Pass | State |
| May 23, 2018 | 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 110000851267 there.
Nearby on the register
- Air-emissions sources in Middlesex County
- Every source record in Middlesex County, A to Z
- Air-emissions sources in Connecticut
- Every source record in Connecticut, A to Z
Figures from EPA’s ICIS-AIR download, loaded September 14, 2026.