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EPA TRI Chemical

Isodrin

CAS Number: 465-73-6

Total releases
3 lbs
Number of facilities
6
Carcinogen
No
PBT substance
Yes
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PBT

According to the EPA Toxics Release Inventory, Isodrin (CAS 465-73-6) is disclosed by 6 Form R facilities totaling 3 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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Isodrin (CAS 465-73-6) 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 DESOTEC US LLC DARLINGTON FACILITY in PA at 1 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

Isodrin: how the 3 lbs splits

3 lbs across all reported pathways

  • Air Releases2 lbs78.7%
  • Off-site Transfers1 lbs21.3%

Isodrin's 3 lbs Form-R total is AIR, with air releases making up 78.7% of the bar. Next segment: off-site transfers at 21.3%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Isodrin releases across all reporting facilities increased by 1360% (0 lbs → 1 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Isodrin is concentrated: Texas accounts for 32.3% of the reported total (2 facilities). Next: Pennsylvania.

  • Texas 1 lbs
  • Pennsylvania 1 lbs
  • Arkansas 1 lbs
  • Nebraska 0 lbs
  • Utah 0 lbs
Industry Sources

Reporting for Isodrin is highly concentrated by industry: Hazardous Waste facilities account for 100.0% of the reported total (6 facilities).

  • Hazardous Waste 3 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Desotec US LLC Darlington Facility
1 lbs
2 Clean Harbors Deer Park LLC
1 lbs
3 Clean Harbors el Dorado LLC
1 lbs
4 Clean Harbors Environmental Services Inc
0 lbs
5 Clean Harbors Aragonite LLC
0 lbs
6 Veolia Es Technical Solutions LLC Port Arthur Facility
0 lbs

Frequently Asked Questions

What is Isodrin in the EPA TRI? ▼
Isodrin (CAS Number: 465-73-6) 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. 6 facilities in the United States report releasing this chemical to the EPA.
How much Isodrin is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 3 lbs of Isodrin releases to the EPA Toxic Release Inventory across 6 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 Isodrin? ▼
Isodrin 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 Isodrin? ▼
Desotec US LLC Darlington Facility in PA reports the largest disclosed release of Isodrin in this dataset, at 1 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 6 facilities on this page.
What is the CAS number for Isodrin? ▼
The CAS (Chemical Abstracts Service) Registry Number for Isodrin is 465-73-6. 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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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.