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EPA TRI Chemical

Octachlorostyrene

CAS Number: 29082-74-4

Total releases
1.5K lbs
Number of facilities
3
Carcinogen
No
PBT substance
Yes
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PBT

According to the EPA Toxics Release Inventory, Octachlorostyrene (CAS 29082-74-4) is disclosed by 3 Form R facilities totaling 1.5K lbs of reported releases. It is also listed as a persistent bioaccumulative toxicant (PBT) in the TRI extract. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Octachlorostyrene (CAS 29082-74-4) 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 PBT (persistent, bioaccumulative, toxic) status above carries a lower TRI reporting threshold than most listed chemicals, reflecting elevated regulatory concern about long-term environmental buildup. The largest individual disclosure in the current dataset comes from US MAGNESIUM LLC in UT at 1.1K 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.

LAND pathway mix

Octachlorostyrene: how the 1.5K lbs splits

1.5K lbs across all reported pathways

  • Land Disposal1.5K lbs99.9%
  • Off-site Transfers2 lbs0.1%
  • Water Discharges0 lbs<0.1%

Octachlorostyrene's 1.5K lbs Form-R total is LAND, with land disposal making up 99.9% of the bar. Next segment: off-site transfers at 0.1%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Octachlorostyrene releases across all reporting facilities decreased by 90% (587 lbs → 61 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Octachlorostyrene is highly concentrated: Utah accounts for 78.2% of the reported total (1 facility). Next: Tennessee.

  • Utah 1.1K lbs
  • Tennessee 217 lbs
  • Mississippi 103 lbs
Industry Sources

Reporting for Octachlorostyrene is highly concentrated by industry: Primary Metals facilities account for 78.2% of the reported total (1 facility). Next: Chemicals.

  • Primary Metals 1.1K lbs
  • Chemicals 320 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 US Magnesium LLC
1.1K lbs
2 Chemours Johnsonville Plant
217 lbs
3 Chemours Delisle Plant
103 lbs

Frequently Asked Questions

What is Octachlorostyrene in the EPA TRI? ▼
Octachlorostyrene (CAS Number: 29082-74-4) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. It is classified as a persistent bioaccumulative toxicant (PBT) in the TRI extract. 3 facilities in the United States report releasing this chemical to the EPA.
How much Octachlorostyrene is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 1.5K lbs of Octachlorostyrene releases to the EPA Toxic Release Inventory across 3 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 Octachlorostyrene? ▼
Octachlorostyrene is not marked as a carcinogen in the TRI classification set. It is also listed as a persistent bioaccumulative toxicant (PBT), which uses lower TRI reporting thresholds. 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 Octachlorostyrene? ▼
US Magnesium LLC in UT reports the largest disclosed release of Octachlorostyrene in this dataset, at 1.1K lbs. Most reporting facilities for this chemical fall under primary metals. Release data is self-reported annually to the EPA under the TRI program. View the full list of 3 facilities on this page.
What is the CAS number for Octachlorostyrene? ▼
The CAS (Chemical Abstracts Service) Registry Number for Octachlorostyrene is 29082-74-4. 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

Persistent Bioaccumulative Toxicant (PBT): This chemical is classified as a PBT by the EPA. PBT chemicals are toxic, persist in the environment, and bioaccumulate in food chains. Because of these properties, even relatively small releases can pose a significant threat to human health and the environment over time.

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.