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EPA TRI Chemical

Methoxychlor

CAS Number: 72-43-5

Total releases
11.1K lbs
Number of facilities
15
Carcinogen
No
PBT substance
Yes
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PBT

According to the EPA Toxics Release Inventory, Methoxychlor (CAS 72-43-5) is disclosed by 15 Form R facilities totaling 11.1K lbs of reported releases. It is also listed as a persistent bioaccumulative toxicant (PBT) in the TRI extract. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Methoxychlor (CAS 72-43-5) 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.

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 PBT (persistent, bioaccumulative, toxic) status above carries a lower TRI reporting threshold than most listed chemicals, reflecting elevated regulatory concern about long-term environmental buildup. The largest individual disclosure in the current dataset comes from CLEAN HARBORS EL DORADO LLC in AR at 3.5K 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

Methoxychlor: how the 11.1K lbs splits

11.1K lbs across all reported pathways

  • Off-site Transfers6.7K lbs59.8%
  • Land Disposal3.9K lbs35.4%
  • Air Releases533 lbs4.8%

Methoxychlor's 11.1K lbs Form-R total is MIXED, with off-site transfers making up 59.8% of the bar. Next segment: land disposal at 35.4%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Methoxychlor releases across all reporting facilities increased by 229% (1.6K lbs → 5.2K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Methoxychlor is concentrated: Arkansas accounts for 33.3% of the reported total (2 facilities). Next: Ohio.

  • Arkansas 3.7K lbs
  • Ohio 2.4K lbs
  • Oregon 2.1K lbs
  • Alabama 1.6K lbs
  • Texas 807 lbs
Industry Sources

Reporting for Methoxychlor is highly concentrated by industry: Hazardous Waste facilities account for 100.0% of the reported total (13 facilities). Next: Nonmetallic Mineral Product.

  • Hazardous Waste 11.1K lbs
  • Nonmetallic Mineral Product 0 lbs
  • Other 0 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Clean Harbors el Dorado LLC
3.5K lbs
2 Heritage Thermal Services
2.4K lbs
3 Chemical Waste Management of the Northwest Inc.
2.1K lbs
4 Chemical Waste Management
1.6K lbs
5 Clean Harbors Deer Park LLC
799 lbs
6 Clean Harbors Environmental Services Inc
517 lbs
7 Elemental Environmental Solutions LLC
224 lbs
8 Veolia N.a. Inc.
9 lbs
9 Veolia Es Technical Solutions LLC Port Arthur Facility
8 lbs
10 Clean Harbors Aragonite LLC
0 lbs
11 Giant Cement Co
0 lbs
12 Ross Incineration Services Inc
0 lbs
13 Tradebe Treatment & Recycling of Tn
0 lbs
14 Arcwood Environmental - Orange LLC
0 lbs
15 Mxi Environmental Services LLC
0 lbs

Frequently Asked Questions

What is Methoxychlor in the EPA TRI? ▼
Methoxychlor (CAS Number: 72-43-5) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. It is classified as a persistent bioaccumulative toxicant (PBT) in the TRI extract. 15 facilities in the United States report releasing this chemical to the EPA.
How much Methoxychlor is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 11.1K lbs of Methoxychlor releases to the EPA Toxic Release Inventory across 15 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 Methoxychlor? ▼
Methoxychlor is not marked as a carcinogen in the TRI classification set. It is also listed as a persistent bioaccumulative toxicant (PBT), which uses lower TRI reporting thresholds. 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 Methoxychlor? ▼
Clean Harbors el Dorado LLC in AR reports the largest disclosed release of Methoxychlor in this dataset, at 3.5K 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 15 facilities on this page.
What is the CAS number for Methoxychlor? ▼
The CAS (Chemical Abstracts Service) Registry Number for Methoxychlor is 72-43-5. 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.

Related Guides

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How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Persistent Bioaccumulative Toxicant (PBT): This chemical is classified as a PBT by the EPA. PBT chemicals are toxic, persist in the environment, and bioaccumulate in food chains. Because of these properties, even relatively small releases can pose a significant threat to human health and the environment over time.

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.