EPA TRI Chemical
Chlorine
CAS Number: 7782-50-5
- Total releases
- 28.5M lbs
- Number of facilities
- 639
- Carcinogen
- No
- PBT substance
- No
According to the EPA Toxics Release Inventory, Chlorine (CAS 7782-50-5) is disclosed by 639 Form R facilities totaling 28.5M lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Chlorine (CAS 7782-50-5) 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 largest individual disclosure in the current dataset comes from US MAGNESIUM LLC in UT at 14.9M 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
Chlorine: how the 28.5M lbs splits
28.5M lbs across all reported pathways
- Air Releases20.5M lbs71.7%
- Land Disposal7.0M lbs24.7%
- Water Discharges546.1K lbs1.9%
- Off-site Transfers479.8K lbs1.7%
Chlorine's 28.5M lbs Form-R total is AIR, with air releases making up 71.7% of the bar. Next segment: land disposal at 24.7%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Chlorine releases across all reporting facilities decreased by 87% (9.9M lbs → 1.3M lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Chlorine is highly concentrated: Utah accounts for 52.4% of the reported total (8 facilities). Next: Nevada.
- Utah 15.0M lbs
- Nevada 5.7M lbs
- Louisiana 1.7M lbs
- Kansas 769.8K lbs
- North Carolina 736.2K lbs
Reporting for Chlorine is highly concentrated by industry: Primary Metals facilities account for 73.8% of the reported total (51 facilities). Next: Chemicals.
- Primary Metals 21.1M lbs
- Chemicals 4.1M lbs
- Electric Utilities 1.1M lbs
- Nonmetallic Mineral Product 645.9K lbs
- Food 629.1K lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Chlorine. Up to 50 shown.
Frequently Asked Questions
What is Chlorine in the EPA TRI? ▼
How much Chlorine is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Chlorine? ▼
Which facilities disclose the most Chlorine? ▼
What is the CAS number for Chlorine? ▼
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.