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EPA TRI Chemical

Chloroprene

CAS Number: 126-99-8

Total releases
214.3K lbs
Number of facilities
17
Carcinogen
Yes
PBT substance
No
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Carcinogen

According to the EPA Toxics Release Inventory, Chloroprene (CAS 126-99-8) is disclosed by 17 Form R facilities totaling 214.3K lbs of reported releases. The TRI extract marks this chemical with a carcinogen classification flag. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Chloroprene (CAS 126-99-8) 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.

The carcinogen flag above reflects an assessment from EPA, the International Agency for Research on Cancer, or the National Toxicology Program, not a TRI-specific determination. The largest individual disclosure in the current dataset comes from DENKA PERFORMANCE ELASTOMER LLC in LA at 207.0K 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

Chloroprene: how the 214.3K lbs splits

214.3K lbs across all reported pathways

  • Air Releases183.1K lbs85.4%
  • Land Disposal17.9K lbs8.4%
  • Off-site Transfers12.6K lbs5.9%
  • Water Discharges788 lbs0.4%

Chloroprene's 214.3K lbs Form-R total is AIR, with air releases making up 85.4% of the bar. Next segment: land disposal at 8.4%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Chloroprene releases across all reporting facilities decreased by 27% (46.3K lbs → 34.0K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Chloroprene is highly concentrated: Louisiana accounts for 99.9% of the reported total (8 facilities). Next: Texas.

  • Louisiana 214.1K lbs
  • Texas 106 lbs
  • Kentucky 96 lbs
  • Nevada 5 lbs
  • Nebraska 2 lbs
Industry Sources

Reporting for Chloroprene is highly concentrated by industry: Chemicals facilities account for 99.9% of the reported total (13 facilities). Next: Electric Utilities.

  • Chemicals 214.1K lbs
  • Electric Utilities 174 lbs
  • Other 5 lbs
  • Hazardous Waste 3 lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of Chloroprene. Up to 50 shown.

# Facility Release (lbs)
1 Denka Performance Elastomer LLC
207.0K lbs
2 Formosa Plastics Corp Louisiana
6.8K lbs
3 Westlake US 2 LLC
174 lbs
4 Westlake Vinyls Inc
96 lbs
5 Formosa Plastics Corp Texas
78 lbs
6 Westlake Vinyls Co
50 lbs
7 Shintech Plaquemine Plant
47 lbs
8 Westlake Chemicals & Vinyls LLC
40 lbs
9 Oxy Vinyls LP Deer Park-Vcm Plant
21 lbs
10 Westlake Chemicals & Vinyls LLC
19 lbs
11 US Army Hawthorne Army Depot New Bomb
5 lbs
12 Oxy Vinyls LP la Porte Vcm Plant
5 lbs
13 Clean Harbors Environmental Services Inc
2 lbs
14 Freeport_olin Bc
1 lbs
15 Occidental Chemical Corp
0 lbs
16 Ross Incineration Services Inc
0 lbs
17 Occidental Chemical Holding Corp - Geismar Plant
0 lbs

Frequently Asked Questions

What is Chloroprene in the EPA TRI? ▼
Chloroprene (CAS Number: 126-99-8) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. The TRI extract marks it with a carcinogen classification flag based on EPA/IARC/NTP listings. 17 facilities in the United States report releasing this chemical to the EPA.
How much Chloroprene is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 214.3K lbs of Chloroprene 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 Chloroprene? ▼
Chloroprene carries a carcinogen classification flag in the TRI database (drawn from EPA, IARC, or NTP listings). 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 Chloroprene? ▼
Denka Performance Elastomer LLC in LA reports the largest disclosed release of Chloroprene in this dataset, at 207.0K 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 Chloroprene? ▼
The CAS (Chemical Abstracts Service) Registry Number for Chloroprene is 126-99-8. 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.

Related Guides

Understanding TRI Data
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How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Carcinogen Classification: This chemical is classified as a known or suspected carcinogen by the EPA under the Toxic Release Inventory program. This classification is based on evaluations by agencies including the International Agency for Research on Cancer (IARC), the National Toxicology Program (NTP), and the EPA itself.

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.