EPA TRI Chemical
Methyl Isocyanate
CAS Number: 624-83-9
- Total releases
- 5.0K lbs
- Number of facilities
- 2
- Carcinogen
- No
- PBT substance
- No
According to the EPA Toxics Release Inventory, Methyl Isocyanate (CAS 624-83-9) is disclosed by 2 Form R facilities totaling 5.0K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Methyl Isocyanate (CAS 624-83-9) 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 ROSS INCINERATION SERVICES INC in OH at 5.0K 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.
OFFSITE pathway mix
Methyl Isocyanate: how the 5.0K lbs splits
5.0K lbs across all reported pathways
- Off-site Transfers5.0K lbs99.8%
- Air Releases9 lbs0.2%
Methyl Isocyanate's 5.0K lbs Form-R total is OFFSITE, with off-site transfers making up 99.8% of the bar. Next segment: air releases at 0.2%.
Trend & Where It's Reported
Between 2019 and 2020, cumulative annual Methyl Isocyanate releases across all reporting facilities increased by 8319% (59 lbs → 4.9K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Methyl Isocyanate is highly concentrated: Ohio accounts for 99.8% of the reported total (1 facility). Next: Texas.
- Ohio 5.0K lbs
- Texas 9 lbs
Reporting for Methyl Isocyanate is highly concentrated by industry: Hazardous Waste facilities account for 100.0% of the reported total (2 facilities).
- Hazardous Waste 5.0K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Methyl Isocyanate. Up to 50 shown.
| # | Facility | Release (lbs) |
|---|---|---|
| 1 | Ross Incineration Services Inc | |
| 2 | Veolia Es Technical Solutions LLC Port Arthur Facility |
Frequently Asked Questions
What is Methyl Isocyanate in the EPA TRI? ▼
How much Methyl Isocyanate is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Methyl Isocyanate? ▼
Which facilities disclose the most Methyl Isocyanate? ▼
What is the CAS number for Methyl Isocyanate? ▼
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.