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EPA TRI Chemical

Methyl Hydrazine

CAS Number: 60-34-4

Total releases
212 lbs
Number of facilities
2
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Methyl Hydrazine (CAS 60-34-4) is disclosed by 2 Form R facilities totaling 212 lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Methyl Hydrazine (CAS 60-34-4) 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 SPACE EXPLORATION TECHNOLOGIES in TX at 199 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 Hydrazine: how the 212 lbs splits

212 lbs across all reported pathways

  • Air Releases212 lbs100.0%

Methyl Hydrazine's 212 lbs Form-R total is AIR, with air releases making up 100.0% of the bar. Off-site transfers stay separate from air, water, and land releases.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2022, cumulative annual Methyl Hydrazine releases across all reporting facilities decreased by 99% (204 lbs → 2 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Methyl Hydrazine is highly concentrated: Texas accounts for 100.0% of the reported total (2 facilities).

  • Texas 212 lbs
Industry Sources

Reporting for Methyl Hydrazine is highly concentrated by industry: Transportation Equipment facilities account for 93.9% of the reported total (1 facility). Next: Hazardous Waste.

  • Transportation Equipment 199 lbs
  • Hazardous Waste 13 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Space Exploration Technologies
199 lbs
2 Veolia Es Technical Solutions LLC Port Arthur Facility
13 lbs

Frequently Asked Questions

What is Methyl Hydrazine in the EPA TRI? ▼
Methyl Hydrazine (CAS Number: 60-34-4) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 2 facilities in the United States report releasing this chemical to the EPA.
How much Methyl Hydrazine is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 212 lbs of Methyl Hydrazine releases to the EPA Toxic Release Inventory across 2 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 Hydrazine? ▼
Methyl Hydrazine 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 Hydrazine? ▼
Space Exploration Technologies in TX reports the largest disclosed release of Methyl Hydrazine in this dataset, at 199 lbs. Most reporting facilities for this chemical fall under transportation equipment. Release data is self-reported annually to the EPA under the TRI program. View the full list of 2 facilities on this page.
What is the CAS number for Methyl Hydrazine? ▼
The CAS (Chemical Abstracts Service) Registry Number for Methyl Hydrazine is 60-34-4. 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
How the Toxic Release Inventory works
Biggest Polluters in America
Which facilities release the most toxics
How to Check Environmental Quality
Step-by-step guide to checking your local environment

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.