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EPA TRI Chemical

Metham Sodium

CAS Number: 137-42-8

Total releases
106.9K lbs
Number of facilities
13
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Metham Sodium (CAS 137-42-8) is disclosed by 13 Form R facilities totaling 106.9K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Metham Sodium (CAS 137-42-8) 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 US ECOLOGY IDAHO INC. in ID at 40.9K 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.

MIXED pathway mix

Metham Sodium: how the 106.9K lbs splits

106.9K lbs across all reported pathways

  • Land Disposal52.3K lbs48.9%
  • Off-site Transfers49.8K lbs46.6%
  • Air Releases4.9K lbs4.5%

Metham Sodium's 106.9K lbs Form-R total is MIXED, with land disposal making up 48.9% of the bar. Next segment: off-site transfers at 46.6%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Metham Sodium releases across all reporting facilities increased by 1824% (1.3K lbs → 24.6K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Metham Sodium is highly concentrated: Idaho accounts for 56.9% of the reported total (2 facilities). Next: Alabama.

  • Idaho 60.8K lbs
  • Alabama 27.4K lbs
  • Texas 11.8K lbs
  • Washington 6.1K lbs
  • Missouri 784 lbs
Industry Sources

Reporting for Metham Sodium is concentrated by industry: Hazardous Waste facilities account for 49.3% of the reported total (2 facilities). Next: Chemicals.

  • Hazardous Waste 52.7K lbs
  • Chemicals 50.0K lbs
  • Petroleum Bulk Terminals 4.3K lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of Metham Sodium. Up to 50 shown.

# Facility Release (lbs)
1 US Ecology Idaho Inc.
40.9K lbs
2 Amvac Chemical Co
27.4K lbs
3 Tessenderlo Kerley Inc.
19.9K lbs
4 Tm Deer Park Services LP
11.8K lbs
5 Tidewater Terminal Co Snake River Terminal
4.3K lbs
6 Tessenderlo Kerley Inc.
1.8K lbs
7 Buckman Laboratories Inc.
784 lbs
8 Kelly Products Inc
25 lbs
9 Amvac Chemical Corp
0 lbs
10 Douglas Products & Packaging Co
0 lbs
11 Tessenderlo Kerely Inc.
0 lbs
12 Kemira Water Solutions Inc.
0 lbs
13 Triest Ag Group Inc
0 lbs

Frequently Asked Questions

What is Metham Sodium in the EPA TRI? ▼
Metham Sodium (CAS Number: 137-42-8) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 13 facilities in the United States report releasing this chemical to the EPA.
How much Metham Sodium is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 106.9K lbs of Metham Sodium releases to the EPA Toxic Release Inventory across 13 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 Metham Sodium? ▼
Metham Sodium 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 Metham Sodium? ▼
US Ecology Idaho Inc. in ID reports the largest disclosed release of Metham Sodium in this dataset, at 40.9K lbs. Most reporting facilities for this chemical fall under hazardous waste. Release data is self-reported annually to the EPA under the TRI program. View the full list of 13 facilities on this page.
What is the CAS number for Metham Sodium? ▼
The CAS (Chemical Abstracts Service) Registry Number for Metham Sodium is 137-42-8. 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

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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.