EPA TRI Chemical
Methyl Tert-Butyl Ether
CAS Number: 1634-04-4
- Total releases
- 1.9M lbs
- Number of facilities
- 186
- Carcinogen
- No
- PBT substance
- No
According to the EPA Toxics Release Inventory, Methyl Tert-Butyl Ether (CAS 1634-04-4) is disclosed by 186 Form R facilities totaling 1.9M lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Methyl Tert-Butyl Ether (CAS 1634-04-4) 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 W.R. GRACE & CO. in OR at 438.7K 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
Methyl Tert-Butyl Ether: how the 1.9M lbs splits
1.9M lbs across all reported pathways
- Air Releases1.1M lbs57.1%
- Off-site Transfers628.3K lbs33.2%
- Land Disposal167.4K lbs8.8%
- Water Discharges15.6K lbs0.8%
Methyl Tert-Butyl Ether's 1.9M lbs Form-R total is MIXED, with air releases making up 57.1% of the bar. Next segment: off-site transfers at 33.2%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Methyl Tert-Butyl Ether releases across all reporting facilities increased by 83% (353.2K lbs → 646.5K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Methyl Tert-Butyl Ether is concentrated: Texas accounts for 39.3% of the reported total (29 facilities). Next: Oregon.
- Texas 743.0K lbs
- Oregon 442.9K lbs
- California 125.2K lbs
- Virginia 98.7K lbs
- Alabama 82.0K lbs
Reporting for Methyl Tert-Butyl Ether is highly concentrated by industry: Chemicals facilities account for 77.3% of the reported total (58 facilities). Next: Hazardous Waste.
- Chemicals 1.5M lbs
- Hazardous Waste 164.6K lbs
- Petroleum 158.0K lbs
- Petroleum Bulk Terminals 45.5K lbs
- Chemical Wholesalers 32.1K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Methyl Tert-Butyl Ether. Up to 50 shown.
Frequently Asked Questions
What is Methyl Tert-Butyl Ether in the EPA TRI? ▼
How much Methyl Tert-Butyl Ether is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Methyl Tert-Butyl Ether? ▼
Which facilities disclose the most Methyl Tert-Butyl Ether? ▼
What is the CAS number for Methyl Tert-Butyl Ether? ▼
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.