EPA TRI Chemical
Methyl Isobutyl Ketone
CAS Number: 108-10-1
- Total releases
- 15.6M lbs
- Number of facilities
- 618
- Carcinogen
- Yes
- PBT substance
- No
According to the EPA Toxics Release Inventory, Methyl Isobutyl Ketone (CAS 108-10-1) is disclosed by 618 Form R facilities totaling 15.6M 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.
Methyl Isobutyl Ketone (CAS 108-10-1) 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 ATI SPECIALTY ALLOYS & COMPONENTS LLC in OR at 1.5M 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
Methyl Isobutyl Ketone: how the 15.6M lbs splits
15.6M lbs across all reported pathways
- Air Releases13.3M lbs85.0%
- Off-site Transfers2.0M lbs12.7%
- Land Disposal323.5K lbs2.1%
- Water Discharges25.4K lbs0.2%
Methyl Isobutyl Ketone's 15.6M lbs Form-R total is AIR, with air releases making up 85.0% of the bar. Next segment: off-site transfers at 12.7%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Methyl Isobutyl Ketone releases across all reporting facilities decreased by 7% (3.1M lbs → 2.9M lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Methyl Isobutyl Ketone is dispersed: North Carolina accounts for 9.9% of the reported total (17 facilities). Next: Oregon.
- North Carolina 1.6M lbs
- Oregon 1.5M lbs
- Tennessee 1.2M lbs
- Pennsylvania 1.2M lbs
- Georgia 1.1M lbs
Reporting for Methyl Isobutyl Ketone is concentrated by industry: Chemicals facilities account for 29.1% of the reported total (207 facilities). Next: Primary Metals.
- Chemicals 4.5M lbs
- Primary Metals 3.3M lbs
- Transportation Equipment 3.0M lbs
- Plastics and Rubber 969.8K lbs
- Chemical Wholesalers 832.6K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Methyl Isobutyl Ketone. Up to 50 shown.
Frequently Asked Questions
What is Methyl Isobutyl Ketone in the EPA TRI? ▼
How much Methyl Isobutyl Ketone is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Methyl Isobutyl Ketone? ▼
Which facilities disclose the most Methyl Isobutyl Ketone? ▼
What is the CAS number for Methyl Isobutyl Ketone? ▼
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.
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.