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EPA TRI Chemical

Methyl Iodide

CAS Number: 74-88-4

Total releases
106.7K lbs
Number of facilities
10
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Methyl Iodide (CAS 74-88-4) is disclosed by 10 Form R facilities totaling 106.7K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Methyl Iodide (CAS 74-88-4) 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 EASTMAN CHEMICAL CO TENNESSEE OPERATIONS in TN at 54.9K 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 Iodide: how the 106.7K lbs splits

106.7K lbs across all reported pathways

  • Air Releases105.2K lbs98.6%
  • Land Disposal1.4K lbs1.3%
  • Off-site Transfers37 lbs<0.1%
  • Water Discharges34 lbs<0.1%

Methyl Iodide's 106.7K lbs Form-R total is AIR, with air releases making up 98.6% of the bar. Next segment: land disposal at 1.3%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Methyl Iodide releases across all reporting facilities increased by 15% (18.4K lbs → 21.2K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Methyl Iodide is highly concentrated: Tennessee accounts for 51.5% of the reported total (1 facility). Next: Texas.

  • Tennessee 54.9K lbs
  • Texas 30.4K lbs
  • Oklahoma 16.9K lbs
  • South Carolina 4.4K lbs
  • Kentucky 75 lbs
Industry Sources

Reporting for Methyl Iodide is highly concentrated by industry: Chemicals facilities account for 100.0% of the reported total (9 facilities). Next: Hazardous Waste.

  • Chemicals 106.7K lbs
  • Hazardous Waste 0 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Eastman Chemical Co Tennessee Operations
54.9K lbs
2 Lyondellbasell Acetyls LLC
28.7K lbs
3 Deepwater Chemicals Inc.
16.9K lbs
4 Ingevity South Carolina LLC Charleston Chemical Plant
4.4K lbs
5 Celanese Ltd Clear Lake Plant
1.7K lbs
6 Iofina Chemical Inc.
75 lbs
7 Arkema Inc Clear Lake
16 lbs
8 Curia Rensselaer Inc.
7 lbs
9 Ineos Acetyls Chemicals Texas City
4 lbs
10 Heritage Thermal Services
0 lbs
11 Pharmacia & Upjohn Co LLC a Subsidiary of Pfizer Inc
0 lbs

Frequently Asked Questions

What is Methyl Iodide in the EPA TRI? ▼
Methyl Iodide (CAS Number: 74-88-4) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 10 facilities in the United States report releasing this chemical to the EPA.
How much Methyl Iodide is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 106.7K lbs of Methyl Iodide releases to the EPA Toxic Release Inventory across 10 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 Methyl Iodide? ▼
Methyl Iodide 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 Methyl Iodide? ▼
Eastman Chemical Co Tennessee Operations in TN reports the largest disclosed release of Methyl Iodide in this dataset, at 54.9K 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 10 facilities on this page.
What is the CAS number for Methyl Iodide? ▼
The CAS (Chemical Abstracts Service) Registry Number for Methyl Iodide is 74-88-4. 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

Understanding TRI Data
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How to Check Environmental Quality
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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.