EPA TRI Facility · Primary Metals
USS MON VALLEY WORKS - EDGAR THOMSON PLANT
Braddock, PA · Parent: US STEEL CORP
- Total releases
- 21.4M lbs
- Chemicals reported
- 21
- Carcinogens
- 5
- Primary pathway
- Off-site Transfers
USS MON VALLEY WORKS - EDGAR THOMSON PLANT has reported 21.4M lbs of toxic releases across 21 chemicals to the EPA Toxic Release Inventory, based on annual facility disclosures from 2019 through 2024. Of the chemicals reported, 5 are classified as carcinogens, representing 24% of the facility's chemical profile. The facility operates in the Primary Metals sector. The primary release pathway is off-site transfers, accounting for 97% of total releases. All release data shown below is self-reported to the EPA under the Emergency Planning and Community Right-to-Know Act (EPCRA) Section 313.
USS MON VALLEY WORKS - EDGAR THOMSON PLANT files annual Form R disclosures to the EPA Toxics Release Inventory under EPCRA Section 313, classified under NAICS 331110 (Primary Metals). Across 5 years of records spanning 2019–2023, the site has disclosed 21.4M lbs in cumulative toxic releases across 21 distinct chemicals, 5 of which (24%) carry a carcinogenic classification.
The dominant release pathway is off-site transfers at 20.8M lbs (97.2% of total volume), followed by air releases at 2.4%. Between 2019 and 2023, reported totals decreased by 36% — from 5.5M lbs to 3.6M lbs. The facility is operated under parent company US STEEL CORP.
TRI Form R values are self-reported estimates, not measured stack emissions, and treat every pound of reported chemical equally regardless of toxicity. Inclusion in the TRI database does not establish a health risk to nearby residents; it documents the annual reporting record that USS MON VALLEY WORKS - EDGAR THOMSON PLANT has filed with the EPA under federal community right-to-know requirements.
Quick Facts
Compare this facility
See how USS MON VALLEY WORKS - EDGAR THOMSON PLANT stacks up against nearby facilities and the typical reporter.
38% less than the comparison
17% more than the comparison
Comparison reflects reported pounds and chemical counts, not toxicity or health risk. Averages cover facilities reporting any release.
How does this facility release toxic chemicals?
How USS MON VALLEY WORKS - EDGAR THOMSON PLANT releases toxic chemicals into the environment. Total: 21.4M lbs.
Emissions Trend Summary
From 2019 to 2023, total releases decreased by 36% (5.5M lbs to 3.6M lbs).
Reported total releases by year
USS MON VALLEY WORKS - EDGAR THOMSON PLANT — annual TRI totals
- 2019
2019
6 million lbs
- 2020
2020
5 million lbs
- 2021
2021
4 million lbs
- 2022
2022
3 million lbs
- 2023
2023
4 million lbs
What this shows Year-over-year reported totals. TRI figures are self-reported estimates and can swing with production levels, waste-rock handling and reporting changes — not only with emissions controls.
| Year | Total | Chemicals |
|---|---|---|
| 2019 | 5.5M lbs | 17 |
| 2020 | 5.0M lbs | 19 |
| 2021 | 4.0M lbs | 18 |
| 2022 | 3.3M lbs | 17 |
| 2023 | 3.6M lbs | 17 |
Chemical Releases
Aggregated across all reporting years (2019–2023). 5 of 21 chemicals are carcinogens. Sorted by total release volume.
Location
Other Facilities in Pennsylvania
About TRI Data
Data as of 2024 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
Data comes from the EPA Toxic Release Inventory (TRI) program. Facilities that manufacture, process, or otherwise use listed toxic chemicals above threshold amounts are required to report annually to the EPA.
Release quantities are self-reported by the facility and may represent estimates rather than exact measurements. "Total releases" includes releases to air, water, land, and off-site transfers for disposal. Quantities shown here are aggregated across all available reporting years.
PlainEnviro presents this data without advocacy framing. The presence of a facility in the TRI database does not by itself indicate a health risk. For site-specific health questions, consult your local environmental or health agency.
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