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EPA TRI Chemical

Hexachloro-1,3-Butadiene

CAS Number: 87-68-3

Total releases
12.0K lbs
Number of facilities
17
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Hexachloro-1,3-Butadiene (CAS 87-68-3) is disclosed by 17 Form R facilities totaling 12.0K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Hexachloro-1,3-Butadiene (CAS 87-68-3) is a chemical tracked by the EPA Toxics Release Inventory (TRI) program under Section 313 of the Emergency Planning and Community Right-to-Know Act. The TRI requires industrial facilities above specified threshold quantities to disclose annual manufacturing, processing, and otherwise-used volumes, along with quantities released to air, water, land, and off-site transfers.

A carcinogen flag, when present on other chemicals in this database, reflects an assessment from EPA, IARC, or the National Toxicology Program rather than a TRI-specific determination. The largest individual disclosure in the current dataset comes from OCCIDENTAL CHEMICAL HOLDING CORP - GEISMAR PLANT in LA at 10.3K lbs.

TRI volumes are self-reported estimates, not measured stack emissions, and each pound counts equally regardless of chemical toxicity, so total pounds should not be equated with total risk. Inclusion of a chemical or facility in the TRI does not itself establish a health hazard; it documents the public right-to-know record. Consult EPA's IRIS (Integrated Risk Information System) and the Agency for Toxic Substances and Disease Registry for health-effect summaries.

AIR pathway mix

Hexachloro-1,3-Butadiene: how the 12.0K lbs splits

12.0K lbs across all reported pathways

  • Air Releases11.0K lbs91.6%
  • Off-site Transfers675 lbs5.6%
  • Land Disposal224 lbs1.9%
  • Water Discharges115 lbs1.0%

Hexachloro-1,3-Butadiene's 12.0K lbs Form-R total is AIR, with air releases making up 91.6% of the bar. Next segment: off-site transfers at 5.6%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Hexachloro-1,3-Butadiene releases across all reporting facilities increased by 1% (2.4K lbs → 2.4K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Hexachloro-1,3-Butadiene is highly concentrated: Louisiana accounts for 96.2% of the reported total (4 facilities). Next: Kansas.

  • Louisiana 11.6K lbs
  • Kansas 217 lbs
  • Texas 115 lbs
  • Kentucky 44 lbs
  • Nebraska 43 lbs
Industry Sources

Reporting for Hexachloro-1,3-Butadiene is highly concentrated by industry: Chemicals facilities account for 91.4% of the reported total (8 facilities). Next: Electric Utilities.

  • Chemicals 11.0K lbs
  • Electric Utilities 892 lbs
  • Hazardous Waste 144 lbs
  • Nonmetallic Mineral Product 0 lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of Hexachloro-1,3-Butadiene. Up to 50 shown.

# Facility Release (lbs)
1 Occidental Chemical Holding Corp - Geismar Plant
10.3K lbs
2 Westlake US 2 LLC
892 lbs
3 Blue Cube Operations LLC - Plaquemine Site
352 lbs
4 Occidental Chemical Corp
217 lbs
5 Westlake Vinyls Inc
44 lbs
6 Clean Harbors Environmental Services Inc
43 lbs
7 Clean Harbors el Dorado LLC
43 lbs
8 Clean Harbors Deer Park LLC
41 lbs
9 Dow Chemical Co Freeport Facility
39 lbs
10 Freeport_olin Bc
17 lbs
11 Veolia Es Technical Solutions LLC Port Arthur Facility
16 lbs
12 Occidental Chemical Corp
2 lbs
13 Heritage Thermal Services
1 lbs
14 Clean Harbors Aragonite LLC
0 lbs
15 Arcwood Environmental - Orange LLC
0 lbs
16 Westlake Chemicals & Vinyls LLC
0 lbs
17 Heidelberg Materials US Cement LLC
0 lbs

Frequently Asked Questions

What is Hexachloro-1,3-Butadiene in the EPA TRI? ▼
Hexachloro-1,3-Butadiene (CAS Number: 87-68-3) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 17 facilities in the United States report releasing this chemical to the EPA.
How much Hexachloro-1,3-Butadiene is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 12.0K lbs of Hexachloro-1,3-Butadiene releases to the EPA Toxic Release Inventory across 17 facilities. Release quantities are self-reported estimates covering air, water, land, and off-site transfers. They are disclosure totals, not toxicity-weighted harm scores.
How does EPA TRI classify Hexachloro-1,3-Butadiene? ▼
Hexachloro-1,3-Butadiene is not marked as a carcinogen in the TRI classification set. TRI classification flags document inventory listing status; they are not a site-specific exposure or health diagnosis. For health-effect summaries see EPA IRIS and ATSDR toxicological profiles.
Which facilities disclose the most Hexachloro-1,3-Butadiene? ▼
Occidental Chemical Holding Corp - Geismar Plant in LA reports the largest disclosed release of Hexachloro-1,3-Butadiene in this dataset, at 10.3K lbs. Most reporting facilities for this chemical fall under chemicals. Release data is self-reported annually to the EPA under the TRI program. View the full list of 17 facilities on this page.
What is the CAS number for Hexachloro-1,3-Butadiene? ▼
The CAS (Chemical Abstracts Service) Registry Number for Hexachloro-1,3-Butadiene is 87-68-3. CAS numbers are unique numerical identifiers assigned to every chemical substance described in the open scientific literature. This identifier is used to search scientific databases and regulatory filings.

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Health Information

Data comes from the EPA Toxic Release Inventory (TRI) program. Release quantities are self-reported by facilities and may represent estimates. The total shown aggregates reports across all facilities and reporting years.

PlainEnviro presents this data without advocacy framing. The presence of a chemical in the TRI database does not by itself indicate a health risk at current exposure levels. For health-related questions about specific chemical exposures, consult your local health agency or a toxicologist.

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Toxic Release Inventory (TRI). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.