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EPA TRI Chemical

Malathion

CAS Number: 121-75-5

Total releases
27.1K lbs
Number of facilities
21
Carcinogen
Yes
PBT substance
No
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Carcinogen

According to the EPA Toxics Release Inventory, Malathion (CAS 121-75-5) is disclosed by 21 Form R facilities totaling 27.1K 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.

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Malathion (CAS 121-75-5) 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 US ECOLOGY NEVADA INC. in NV at 12.8K 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

Malathion: how the 27.1K lbs splits

27.1K lbs across all reported pathways

  • Land Disposal12.8K lbs47.0%
  • Off-site Transfers12.6K lbs46.6%
  • Air Releases1.7K lbs6.4%
  • Water Discharges15 lbs0.1%

Malathion's 27.1K lbs Form-R total is MIXED, with land disposal making up 47.0% 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 Malathion releases across all reporting facilities increased by 67% (519 lbs → 866 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Malathion is concentrated: Nevada accounts for 47.0% of the reported total (1 facility). Next: Mississippi.

  • Nevada 12.8K lbs
  • Mississippi 6.4K lbs
  • Texas 5.3K lbs
  • Nebraska 2.5K lbs
  • Georgia 52 lbs
Industry Sources

Reporting for Malathion is highly concentrated by industry: Hazardous Waste facilities account for 56.2% of the reported total (10 facilities). Next: Chemicals.

  • Hazardous Waste 15.3K lbs
  • Chemicals 11.9K lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 US Ecology Nevada Inc.
12.8K lbs
2 Platte Chemical Co
6.4K lbs
3 Schirm USA Inc.
5.3K lbs
4 Clean Harbors Environmental Services Inc
2.5K lbs
5 Scotts Co Fort Madison Iowa
49 lbs
6 Drexel Chemical Co
37 lbs
7 Helena Industries Inc
15 lbs
8 Clean Harbors Aragonite LLC
9 lbs
9 Heritage Thermal Services
4 lbs
10 Veolia N.a. Inc.
2 lbs
11 Clean Harbors Deer Park LLC
2 lbs
12 Elemental Environmental Solutions LLC
1 lbs
13 Clean Harbors el Dorado LLC
1 lbs
14 Ross Incineration Services Inc
0 lbs
15 Arcwood Environmental - Orange LLC
0 lbs
16 Gowan Milling LLC
0 lbs
17 Control Solutions Inc.
0 lbs
18 Voluntary Purchasing Groups Inc
0 lbs
19 Pbi/gordon Corp - Jayhawk Facility
0 lbs
20 Douglas Products & Packaging Co
0 lbs
21 Chemsico
0 lbs

Frequently Asked Questions

What is Malathion in the EPA TRI? ▼
Malathion (CAS Number: 121-75-5) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. The TRI extract marks it with a carcinogen classification flag based on EPA/IARC/NTP listings. 21 facilities in the United States report releasing this chemical to the EPA.
How much Malathion is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 27.1K lbs of Malathion releases to the EPA Toxic Release Inventory across 21 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 Malathion? ▼
Malathion carries a carcinogen classification flag in the TRI database (drawn from EPA, IARC, or NTP listings). 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 Malathion? ▼
US Ecology Nevada Inc. in NV reports the largest disclosed release of Malathion in this dataset, at 12.8K 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 21 facilities on this page.
What is the CAS number for Malathion? ▼
The CAS (Chemical Abstracts Service) Registry Number for Malathion is 121-75-5. 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.

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Step-by-step guide to checking your local environment

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.

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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.