PlainEnviro

EPA TRI Chemical

Styrene

CAS Number: 100-42-5

Total releases
162.0M lbs
Number of facilities
1,340
Carcinogen
Yes
PBT substance
No
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Carcinogen

According to the EPA Toxics Release Inventory, Styrene (CAS 100-42-5) is disclosed by 1,340 Form R facilities totaling 162.0M 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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Styrene (CAS 100-42-5) 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 ONYX COLLECTION INC in KS at 3.5M 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

Styrene: how the 162.0M lbs splits

162.0M lbs across all reported pathways

  • Air Releases147.6M lbs91.1%
  • Off-site Transfers12.6M lbs7.8%
  • Land Disposal1.8M lbs1.1%
  • Water Discharges15.3K lbs<0.1%

Styrene's 162.0M lbs Form-R total is AIR, with air releases making up 91.1% of the bar. Next segment: off-site transfers at 7.8%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Styrene releases across all reporting facilities decreased by 6% (32.7M lbs → 30.7M lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Styrene is dispersed: Indiana accounts for 13.8% of the reported total (87 facilities). Next: Texas.

  • Indiana 22.3M lbs
  • Texas 15.6M lbs
  • Tennessee 15.4M lbs
  • Florida 12.1M lbs
  • South Carolina 11.4M lbs
Industry Sources

Reporting for Styrene is highly concentrated by industry: Plastics and Rubber facilities account for 55.3% of the reported total (494 facilities). Next: Transportation Equipment.

  • Plastics and Rubber 89.5M lbs
  • Transportation Equipment 47.2M lbs
  • Chemicals 15.5M lbs
  • Machinery 1.8M lbs
  • Electrical Equipment 1.6M lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Onyx Collection Inc
3.5M lbs
2 Explore Industries USA Inc
3.0M lbs
3 Arcosa Marine Products Inc Plt 73
2.6M lbs
4 Yamaha Jet Boat Manufacturing USA Inc
2.2M lbs
5 Carfair Composites USA Inc - Anniston
2.2M lbs
6 Chaparral Boats Inc
2.0M lbs
7 Malibu Boats LLC
1.8M lbs
8 Maax US Corp.
1.7M lbs
9 Kohler Co
1.6M lbs
10 Hamilton Bathware
1.5M lbs
11 Better Way Products
1.5M lbs
12 Valmont Composite Structures Newberry
1.4M lbs
13 Mastercraft Boat Co
1.4M lbs
14 Composite Technology Assemblies LLC
1.4M lbs
15 Polynt Composites USA Inc.
1.4M lbs
16 Lyondell Chemical Co
1.3M lbs
17 Teijin Automotive Technologies - Van Wert
1.3M lbs
18 Thursday Pools
1.2M lbs
19 Boston Whaler Inc
1.2M lbs
20 Sea-Hunt Boat Manufacturing Co Inc
1.2M lbs
21 Lm Wind Power Blades Inc
1.1M lbs
22 Kohler Co
1.1M lbs
23 Clarion Bathware
1.1M lbs
24 Latham Pool Products Inc D/b/a Viking Pools-Wv
1.1M lbs
25 Latham Pool Products Inc D/b/a Viking Pools-Nc
1.1M lbs
26 Seabring Marine Industries Inc.
1.1M lbs
27 Nautique Boat Co Inc.
1.1M lbs
28 Sea Ray Boats Tellico Facility
1.1M lbs
29 Kbk Industries LLC
978.0K lbs
30 Maax US Corp
974.0K lbs
31 Cobalt Boats LLC
949.1K lbs
32 Edwards Fiberglass
941.9K lbs
33 Skier's Choice Inc
929.8K lbs
34 Praxis Cos LLC
918.8K lbs
35 Tracker Marine LLC
915.2K lbs
36 Tracker Marine Clinton
912.6K lbs
37 Explore Industries USA Inc.
894.8K lbs
38 Structural Composites of India Na Inc
892.8K lbs
39 Regal Marine Industries Inc.
890.1K lbs
40 Aquatic Co
889.2K lbs
41 Xerxes Corp
885.7K lbs
42 Therma-Tru Corp
871.1K lbs
43 Better Way Products
863.1K lbs
44 Front Line Manufacturing
861.7K lbs
45 Grady White Boats Inc.
845.5K lbs
46 Enduro Composites Inc.-Houston Central Green Facility
818.8K lbs
47 Xerxes Corp
795.3K lbs
48 Ranger Boats
791.7K lbs
49 Barrier Reef Pools
759.1K lbs
50 Xerxes Corp
758.4K lbs

Frequently Asked Questions

What is Styrene in the EPA TRI? ▼
Styrene (CAS Number: 100-42-5) 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. 1,340 facilities in the United States report releasing this chemical to the EPA.
How much Styrene is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 162.0M lbs of Styrene releases to the EPA Toxic Release Inventory across 1,340 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 Styrene? ▼
Styrene 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 Styrene? ▼
Onyx Collection Inc in KS reports the largest disclosed release of Styrene in this dataset, at 3.5M lbs. Most reporting facilities for this chemical fall under plastics and rubber. Release data is self-reported annually to the EPA under the TRI program. View the full list of 1,340 facilities on this page.
What is the CAS number for Styrene? ▼
The CAS (Chemical Abstracts Service) Registry Number for Styrene is 100-42-5. 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
How the Toxic Release Inventory works
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

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.