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EPA TRI Chemical

Phosphine

CAS Number: 7803-51-2

Total releases
22.5K lbs
Number of facilities
4
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Phosphine (CAS 7803-51-2) is disclosed by 4 Form R facilities totaling 22.5K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Phosphine (CAS 7803-51-2) 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 P4 PRODUCTION LLC in ID at 22.2K 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

Phosphine: how the 22.5K lbs splits

22.5K lbs across all reported pathways

  • Air Releases22.5K lbs99.9%
  • Water Discharges32 lbs0.1%
  • Land Disposal0 lbs<0.1%

Phosphine's 22.5K lbs Form-R total is AIR, with air releases making up 99.9% of the bar. Next segment: water discharges at 0.1%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Phosphine releases across all reporting facilities decreased by 8% (4.7K lbs → 4.3K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Phosphine is highly concentrated: Idaho accounts for 98.4% of the reported total (1 facility). Next: Virginia.

  • Idaho 22.2K lbs
  • Virginia 295 lbs
  • Pennsylvania 39 lbs
  • South Carolina 25 lbs
Industry Sources

Reporting for Phosphine is highly concentrated by industry: Chemicals facilities account for 100.0% of the reported total (4 facilities).

  • Chemicals 22.5K lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 P4 Production LLC
22.2K lbs
2 Degesch America Inc
295 lbs
3 Versum Materials US LLC
39 lbs
4 Solvay USA LLC
25 lbs

Frequently Asked Questions

What is Phosphine in the EPA TRI? ▼
Phosphine (CAS Number: 7803-51-2) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 4 facilities in the United States report releasing this chemical to the EPA.
How much Phosphine is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 22.5K lbs of Phosphine releases to the EPA Toxic Release Inventory across 4 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 Phosphine? ▼
Phosphine 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 Phosphine? ▼
P4 Production LLC in ID reports the largest disclosed release of Phosphine in this dataset, at 22.2K lbs. Most reporting facilities for this chemical fall under chemicals. Release data is self-reported annually to the EPA under the TRI program. View the full list of 4 facilities on this page.
What is the CAS number for Phosphine? ▼
The CAS (Chemical Abstracts Service) Registry Number for Phosphine is 7803-51-2. 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
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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.