EPA TRI Chemical
Dicyclopentadiene
CAS Number: 77-73-6
- Total releases
- 1.5M lbs
- Number of facilities
- 105
- Carcinogen
- No
- PBT substance
- No
According to the EPA Toxics Release Inventory, Dicyclopentadiene (CAS 77-73-6) is disclosed by 105 Form R facilities totaling 1.5M lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Dicyclopentadiene (CAS 77-73-6) 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 TM DEER PARK SERVICES LP in TX at 346.7K 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.
MIXED pathway mix
Dicyclopentadiene: how the 1.5M lbs splits
1.5M lbs across all reported pathways
- Air Releases680.0K lbs46.7%
- Off-site Transfers424.8K lbs29.2%
- Land Disposal349.2K lbs24.0%
- Water Discharges557 lbs<0.1%
Dicyclopentadiene's 1.5M lbs Form-R total is MIXED, with air releases making up 46.7% of the bar. Next segment: off-site transfers at 29.2%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Dicyclopentadiene releases across all reporting facilities decreased by 18% (355.0K lbs → 289.7K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Dicyclopentadiene is highly concentrated: Texas accounts for 53.6% of the reported total (42 facilities). Next: Louisiana.
- Texas 779.0K lbs
- Louisiana 285.9K lbs
- Pennsylvania 107.3K lbs
- North Carolina 48.2K lbs
- Kentucky 47.9K lbs
Reporting for Dicyclopentadiene is highly concentrated by industry: Chemicals facilities account for 66.2% of the reported total (74 facilities). Next: Hazardous Waste.
- Chemicals 962.6K lbs
- Hazardous Waste 351.0K lbs
- Plastics and Rubber 125.6K lbs
- Petroleum 9.3K lbs
- Transportation Equipment 5.8K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Dicyclopentadiene. Up to 50 shown.
Frequently Asked Questions
What is Dicyclopentadiene in the EPA TRI? ▼
How much Dicyclopentadiene is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Dicyclopentadiene? ▼
Which facilities disclose the most Dicyclopentadiene? ▼
What is the CAS number for Dicyclopentadiene? ▼
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.
Related
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.