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EPA TRI Chemical

Hexachlorocyclopentadiene

CAS Number: 77-47-4

Total releases
2.3K lbs
Number of facilities
7
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Hexachlorocyclopentadiene (CAS 77-47-4) is disclosed by 7 Form R facilities totaling 2.3K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Hexachlorocyclopentadiene (CAS 77-47-4) 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 largest individual disclosure in the current dataset comes from DDP SPECIALTY ELECTRONIC MATERIALS US 5 LLC in OH at 2.1K 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.

OFFSITE pathway mix

Hexachlorocyclopentadiene: how the 2.3K lbs splits

2.3K lbs across all reported pathways

  • Off-site Transfers2.2K lbs97.1%
  • Air Releases57 lbs2.5%
  • Water Discharges10 lbs0.4%

Hexachlorocyclopentadiene's 2.3K lbs Form-R total is OFFSITE, with off-site transfers making up 97.1% of the bar. Next segment: air releases at 2.5%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Hexachlorocyclopentadiene releases across all reporting facilities increased by 23% (384 lbs → 471 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Hexachlorocyclopentadiene is highly concentrated: Ohio accounts for 93.2% of the reported total (2 facilities). Next: Texas.

  • Ohio 2.1K lbs
  • Texas 157 lbs
  • Louisiana 0 lbs
  • Indiana 0 lbs
Industry Sources

Reporting for Hexachlorocyclopentadiene is highly concentrated by industry: Chemicals facilities account for 100.0% of the reported total (3 facilities). Next: Electric Utilities.

  • Chemicals 2.3K lbs
  • Electric Utilities 0 lbs
  • Hazardous Waste 0 lbs
  • Nonmetallic Mineral Product 0 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Ddp Specialty Electronic Materials US 5 LLC
2.1K lbs
2 Metton America Inc
157 lbs
3 Westlake US 2 LLC
0 lbs
4 Heritage Thermal Services
0 lbs
5 Arcwood Environmental - Orange LLC
0 lbs
6 Blue Cube Operations LLC - Plaquemine Site
0 lbs
7 Heidelberg Materials US Cement LLC
0 lbs

Frequently Asked Questions

What is Hexachlorocyclopentadiene in the EPA TRI? ▼
Hexachlorocyclopentadiene (CAS Number: 77-47-4) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 7 facilities in the United States report releasing this chemical to the EPA.
How much Hexachlorocyclopentadiene is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 2.3K lbs of Hexachlorocyclopentadiene releases to the EPA Toxic Release Inventory across 7 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 Hexachlorocyclopentadiene? ▼
Hexachlorocyclopentadiene 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 Hexachlorocyclopentadiene? ▼
Ddp Specialty Electronic Materials US 5 LLC in OH reports the largest disclosed release of Hexachlorocyclopentadiene in this dataset, at 2.1K 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 7 facilities on this page.
What is the CAS number for Hexachlorocyclopentadiene? ▼
The CAS (Chemical Abstracts Service) Registry Number for Hexachlorocyclopentadiene is 77-47-4. 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.

Related Guides

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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.