EPA TRI Chemical
Selenium
CAS Number: 7782-49-2
- Total releases
- 5.5M lbs
- Number of facilities
- 39
- Carcinogen
- No
- PBT substance
- No
According to the EPA Toxics Release Inventory, Selenium (CAS 7782-49-2) is disclosed by 39 Form R facilities totaling 5.5M lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Selenium (CAS 7782-49-2) 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 AGC FLAT GLASS N AMERICA INC in KY at 3.7M 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.
OFFSITE pathway mix
Selenium: how the 5.5M lbs splits
5.5M lbs across all reported pathways
- Off-site Transfers3.8M lbs70.0%
- Land Disposal1.5M lbs27.8%
- Air Releases116.5K lbs2.1%
- Water Discharges3.9K lbs0.1%
Selenium's 5.5M lbs Form-R total is OFFSITE, with off-site transfers making up 70.0% of the bar. Next segment: land disposal at 27.8%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Selenium releases across all reporting facilities increased by 61% (313.7K lbs → 503.5K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Selenium is highly concentrated: Kentucky accounts for 66.8% of the reported total (1 facility). Next: Nevada.
- Kentucky 3.7M lbs
- Nevada 877.4K lbs
- Nebraska 319.2K lbs
- Texas 172.2K lbs
- Utah 113.7K lbs
Reporting for Selenium is highly concentrated by industry: Nonmetallic Mineral Product facilities account for 69.3% of the reported total (6 facilities). Next: Hazardous Waste.
- Nonmetallic Mineral Product 3.8M lbs
- Hazardous Waste 1.6M lbs
- Chemicals 21.0K lbs
- Electric Utilities 10.3K lbs
- Petroleum 3.8K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Selenium. Up to 50 shown.
Frequently Asked Questions
What is Selenium in the EPA TRI? ▼
How much Selenium is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Selenium? ▼
Which facilities disclose the most Selenium? ▼
What is the CAS number for Selenium? ▼
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.