EPA TRI Chemical
Selenium Compounds
EPA TRI Category Code: N725
- Total releases
- 8.8M lbs
- Number of facilities
- 120
- Carcinogen
- No
- PBT substance
- No
According to the EPA Toxics Release Inventory, Selenium Compounds (EPA TRI Category Code N725) is disclosed by 120 Form R facilities totaling 8.8M lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Selenium Compounds (EPA TRI Category Code N725) 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 NEVADA GOLD MINES LLC - CARLIN SOUTH AREA in NV at 2.2M 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.
LAND pathway mix
Selenium Compounds: how the 8.8M lbs splits
8.8M lbs across all reported pathways
- Land Disposal7.6M lbs86.1%
- Off-site Transfers984.0K lbs11.2%
- Air Releases193.8K lbs2.2%
- Water Discharges39.2K lbs0.4%
Selenium Compounds's 8.8M lbs Form-R total is LAND, with land disposal making up 86.1% of the bar. Next segment: off-site transfers at 11.2%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Selenium Compounds releases across all reporting facilities decreased by 57% (1.9M lbs → 804.3K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Selenium Compounds is concentrated: Nevada accounts for 48.0% of the reported total (6 facilities). Next: California.
- Nevada 4.2M lbs
- California 1.6M lbs
- Texas 805.9K lbs
- Arizona 272.5K lbs
- West Virginia 253.1K lbs
Reporting for Selenium Compounds is highly concentrated by industry: Metal Mining facilities account for 51.5% of the reported total (10 facilities). Next: Hazardous Waste.
- Metal Mining 4.5M lbs
- Hazardous Waste 1.8M lbs
- Primary Metals 984.2K lbs
- Electric Utilities 911.0K lbs
- Chemicals 272.6K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Selenium Compounds. Up to 50 shown.
Frequently Asked Questions
What is Selenium Compounds in the EPA TRI? ▼
How much Selenium Compounds is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Selenium Compounds? ▼
Which facilities disclose the most Selenium Compounds? ▼
Why is Selenium Compounds listed under code N725 instead of a CAS number? ▼
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.
Related
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.