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Chloroprene

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Carcinogen

CAS Number: 126-99-8

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.

Across the United States, 17 facilities have filed TRI Form R disclosures for Chloroprene, with a cumulative reported release volume of 214.3K lbs. The chemical carries a carcinogen classification in the TRI database, based on assessments from EPA, IARC, or the National Toxicology Program. 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.

Release Summary

Total Releases
214.3K lbs
Number of Facilities
17
Carcinogen
Yes
Persistent Bioaccumulative Toxicant
No

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? ▼
Chloroprene (CAS Number: 126-99-8) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is classified as a known or suspected carcinogen. 17 facilities in the United States report releasing this chemical to the EPA.
How much Chloroprene is released in the U.S.? ▼
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. This includes releases to air, water, land, and off-site transfers.
Is Chloroprene harmful to health? ▼
Chloroprene is classified as a known or suspected carcinogen by the EPA, based on evaluations from IARC, NTP, or EPA itself. Health effects depend on exposure levels, duration, and route. For specific health questions, consult a toxicologist or your local health agency.
Which facilities release the most Chloroprene? ▼
The largest reported releasers of Chloroprene include facilities across multiple states. 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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Biggest Polluters in America
Which facilities release the most toxics
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 Editorial

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.