EPA TRI Chemical
Propylene Oxide
CAS Number: 75-56-9
- Total releases
- 1.8M lbs
- Number of facilities
- 105
- Carcinogen
- Yes
- PBT substance
- No
According to the EPA Toxics Release Inventory, Propylene Oxide (CAS 75-56-9) is disclosed by 105 Form R facilities totaling 1.8M lbs of reported releases. The TRI extract marks this chemical with a carcinogen classification flag. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.
Propylene Oxide (CAS 75-56-9) 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.
The carcinogen flag above reflects an assessment from EPA, the International Agency for Research on Cancer, or the National Toxicology Program, not a TRI-specific determination. The largest individual disclosure in the current dataset comes from LYONDELL CHEMICAL CO in TX at 372.1K 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
Propylene Oxide: how the 1.8M lbs splits
1.8M lbs across all reported pathways
- Air Releases1.6M lbs88.8%
- Off-site Transfers124.0K lbs6.8%
- Land Disposal73.3K lbs4.0%
- Water Discharges5.6K lbs0.3%
Propylene Oxide's 1.8M lbs Form-R total is AIR, with air releases making up 88.8% of the bar. Next segment: off-site transfers at 6.8%.
Trend & Where It's Reported
Between 2019 and 2023, cumulative annual Propylene Oxide releases across all reporting facilities increased by 5% (387.1K lbs → 404.6K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.
Reporting for Propylene Oxide is highly concentrated: Texas accounts for 50.6% of the reported total (32 facilities). Next: Iowa.
- Texas 918.7K lbs
- Iowa 262.4K lbs
- Indiana 235.0K lbs
- Louisiana 127.7K lbs
- Missouri 62.2K lbs
Reporting for Propylene Oxide is highly concentrated by industry: Chemicals facilities account for 64.1% of the reported total (76 facilities). Next: Food.
- Chemicals 1.2M lbs
- Food 587.4K lbs
- Hazardous Waste 60.5K lbs
- Transportation Equipment 2.4K lbs
- Chemical Wholesalers 669 lbs
Which facilities release the most of this chemical?
Facilities with the largest reported releases of Propylene Oxide. Up to 50 shown.
Frequently Asked Questions
What is Propylene Oxide in the EPA TRI? ▼
How much Propylene Oxide is disclosed in U.S. TRI filings? ▼
How does EPA TRI classify Propylene Oxide? ▼
Which facilities disclose the most Propylene Oxide? ▼
What is the CAS number for Propylene Oxide? ▼
Health Information
Carcinogen Classification: This chemical is classified as a known or suspected carcinogen by the EPA under the Toxic Release Inventory program. This classification is based on evaluations by agencies including the International Agency for Research on Cancer (IARC), the National Toxicology Program (NTP), and the EPA itself.
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.