Clean Air Act stationary source · ICIS-AIR LA0000002208900001

UNION CARBIDE CORP - ST CHARLES OPERATIONS, Hahnville, LA: Clean Air Act compliance record, inspections, violations, penalties

Name: UNION CARBIDE CORP - ST CHARLES OPERATIONS, ICIS-AIR LA0000002208900001: Clean Air Act stationary source record
Creator: Velarion Records
License: https://www.usa.gov/government-works

OperatingOperating status
Major sourceEmissions classification
No Violation IdentifiedCurrent violation status, as filed
11Compliance evaluations since January 1, 2017
0High-priority violations since January 1, 2017
8Formal enforcement actions since January 1, 2017

UNION CARBIDE CORP - ST CHARLES OPERATIONS, at 355 HWY 3142, Hahnville in St. Charles County, Louisiana, 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”. St. Charles 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	UNION CARBIDE CORP - ST CHARLES OPERATIONS
ICIS-AIR ID	LA0000002208900001
EPA facility registry ID	110018861793
Operating status	Operating
Emissions classification	Major source
Current violation status (ICIS-AIR high-priority violation field)	No Violation Identified
Address	355 HWY 3142, Hahnville, LA 70057
County	St. Charles County
In a nonattainment county	Yes (EPA Green Book)
Industry (NAICS)	Chemical manufacturing (NAICS 3251)
SIC code	2869
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 UNION CARBIDE CORP - ST CHARLES OPERATIONS 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

11Evaluations since January 1, 2017
3Full compliance evaluations

Date	What EPA recorded	Agency	Programs
September 25, 2024	PCE On-Site	U.S. EPA	MACT Standards (40 CFR Part 63); National Emission Standards for Hazardous Air Pollutants (40 CFR Part 61); Title V Permits
April 20, 2022	PCE On-Site	U.S. EPA	MACT Standards (40 CFR Part 63); Title V Permits
November 1, 2021	FCE On-Site	State	MACT Standards (40 CFR Part 63); National Emission Standards for Hazardous Air Pollutants (40 CFR Part 61); 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
February 28, 2020	PCE Off-Site	U.S. EPA	Prevention of Accidental Release/General Duty Clause; Risk Management Program
June 28, 2019	PCE Off-Site	U.S. EPA	State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
June 24, 2019	FCE On-Site	State	MACT Standards (40 CFR Part 63); National Emission Standards for Hazardous Air Pollutants (40 CFR Part 61); New Source Performance Standards; State or Local rule or regulation that is not federally-enforceable; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits
October 31, 2018	PCE Off-Site	State	State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
October 17, 2018	PCE Off-Site	State	State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
August 31, 2018	PCE Off-Site	U.S. EPA	Hazardous Air Pollutants
April 26, 2018	PCE Off-Site	U.S. EPA	Federal Implementation Plan for National Primary and Secondary Ambient Air Quality Standards
June 5, 2017	FCE On-Site	State	MACT Standards (40 CFR Part 63); National Emission Standards for Hazardous Air Pollutants (40 CFR Part 61); New Source Performance Standards; State Implementation Plan for National Primary and Secondary Ambient Air Quality Standards; Title V Permits

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 LA0000002208900001 since January 1, 2017.

Enforcement and penalties

8 formal enforcement actions since January 1, 2017, 4 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
January 15, 2026	Administrative Order	State	$0
January 31, 2025	Administrative Order	State	$18,089
November 28, 2022	Administrative Order	State	$175,000
December 30, 2021	Administrative Order	State	$20,800
June 10, 2021	Civil Judicial Action	U.S. EPA	$3,000,000
November 17, 2020	CAA 113A Admin Compliance Order (Non-Penalty)	U.S. EPA	$0
September 27, 2019	CAA 113A Admin Compliance Order (Non-Penalty)	U.S. EPA	$0
December 13, 2018	Administrative Order	State	$0

Informal enforcement

Date	What EPA recorded	Agency
July 29, 2025	Warning Letter	State
July 17, 2025	Notice of Violation	U.S. EPA
June 20, 2025	Warning Letter	State
June 12, 2023	Notice of Violation	State
April 21, 2021	Warning Letter	State
March 8, 2021	Warning Letter	State
October 22, 2019	Warning Letter	State
October 10, 2019	Warning Letter	State
August 28, 2019	Notice of Violation	U.S. EPA
December 13, 2018	Notice of Violation	State
April 18, 2018	Notice of Violation	State

Stack tests

2Stack tests since January 1, 2017
1Recorded as failed

Date	What EPA recorded	Agency
January 16, 2025	Fail	State
January 26, 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.

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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 110018861793 there.

Nearby on the register

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

This page from the Velarion Records public-records register covers the Clean Air Act compliance record of UNION CARBIDE CORP - ST CHARLES OPERATIONS in Hahnville, LA, including inspections, violations, penalties, operating status and emissions classification. The page lists 11 compliance evaluations since January 1, 2017, 0 high-priority violations since January 1, 2017 and 8 formal enforcement actions since January 1, 2017. It records operating status as Operating, emissions classification as Major source and current violation status as No Violation Identified.