EPA TRI Facility · Primary Metals
Uss Mon Valley Works - Irvin Plant
West Mifflin, PA · Parent: US Steel Corp
- Total releases
- 747.4K lbs
- Chemicals reported
- 10
- Carcinogens
- 3
- Primary pathway
- Air Releases
AIR Form-R mix
Uss Mon Valley Works - Irvin Plant: how the 826.5K lbs splits
826.5K lbs across all reported pathways
- Air Releases 724.1K lbs 87.6%
- Off-site Transfers 95.7K lbs 11.6%
- Water Discharges 6.7K lbs 0.8%
- Land Disposal 0 lbs <0.1%
Uss Mon Valley Works - Irvin Plant's 826.5K lbs Form-R total is AIR - air releases is 87.6% of the bar. Next segment: off-site transfers at 11.6%. Leading chemical by pounds: Ethylene.
Carcinogen-classified pounds vs other reported pounds
Same cumulative TRI total as above, split by EPA/IARC carcinogen classification on each chemical: pounds share, not chemical count. Classification is not a site health-risk score.
MID volume AIR pathway CARC-LEAN
Uss Mon Valley Works - Irvin Plant is an EPA Toxics Release Inventory reporter in West Mifflin, PA, in the primary metals sector. It reported 79.1K lbs of releases across 8 chemicals in 2024, and 747.4K lbs in total across its 2019-2024 reporting years. That ranks 1,555 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Pennsylvania's 1,010 reporting TRI sites, pounds #1 is not chemical-count #1. Uss Mon Valley Works - Irvin Plant is pounds #48 and chemical-count #92 at 747.4K lbs. Max Environmental -- Yukon Facility leads reported pounds (34.8M lbs) at 18 chemicals (chemical-count #24). Keystone Cement Co leads chemical count at 53 chemicals (155.4K lbs, pounds #149). Reported volume fell against 2022. Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Liberty Pultrusions; Lafarge - Duquesne Slag; Tech Met Inc.; Safety-Kleen Systems West Mifflin (wmp). Similar-scale Primary Metals peers outside Pennsylvania: Mueller Co.; Real Alloy Specification LLC; Basf Corp; Grede LLC - Iron Mountain. Other US Steel Corp sites in this extract: Uss Gary Works; Uss Mon Valley Works - Edgar Thomson Plant; Uss-Clairton Plant; U.S. Steel Granite City Works. Largest disclosed chemicals by pounds: Ethylene; Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Manganese And Manganese Compounds; Zinc compounds.
Uss Mon Valley Works - Irvin Plant stamps MID volume with a dominant AIR pathway (87.6% air releases) across 10 chemicals · 3 carcinogen-classified. Cumulative Form-R extract: 747.4K lbs (2019–2024). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include Mueller Co. and Real Alloy Specification LLC.
Uss Mon Valley Works - Irvin Plant vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
747K lbs Top 6% higher than 94% of 25,986 reporting TRI facilities
Each bar is a $1M-wide band; taller bars hold more reporting TRI facilities. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
Uss Mon Valley Works - Irvin Plant in the Primary Metals sector extract
Among the 1,603 Primary Metals facilities in this database, Uss Mon Valley Works - Irvin Plant reports the 175th-largest volume, placing it in the top 10.9% of its sector. Scale peers outside Pennsylvania include Mueller Co. and Real Alloy Specification LLC.
Sector rank uses reported TRI pounds only. Share callouts need ≥1,000 lbs so tiny totals cannot mint a false signal.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Uss Mon Valley Works - Irvin Plant's total reported releases fell from 101.2 thousand lb in 2022 to 79.2 thousand lb in 2023, based on EPA TRI filings.
- Uss Mon Valley Works - Irvin Plant's air releases fell from 90.6 thousand lb in 2022 to 67.0 thousand lb in 2023, based on EPA TRI filings.
- Uss Mon Valley Works - Irvin Plant's off-site transfers rose from 9.3 thousand lb in 2022 to 11.1 thousand lb in 2023, based on EPA TRI filings.
- Uss Mon Valley Works - Irvin Plant's water releases fell from 1.2 thousand lb in 2022 to 1.1 thousand lb in 2023, based on EPA TRI filings.
Uss Mon Valley Works - Irvin Plant Form-R facts
Compare this facility
See how Uss Mon Valley Works - Irvin Plant stacks up against nearby facilities and the typical reporter.
5.4× more than the comparison
10.0× 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 - Irvin Plant releases toxic chemicals into the environment. Total: 826.5K lbs.
Emissions Trend Summary
From 2019 to 2024, total releases decreased by 79% (377.6K lbs to 79.1K lbs).
Uss Mon Valley Works - Irvin Plant: annual Form-R pounds
MID site · AIR pathway · TRI years 2019–2024
- 2019 0
- 2020 0
- 2021 0
- 2022 0
- 2023 0
- 2024 0
What this shows Uss Mon Valley Works - Irvin Plant year-over-year reported totals (decreased by 79% from 2019 to 2024). TRI figures are self-reported estimates and can swing with production, waste handling, and reporting changes, not only with controls. Lead chemical in the extract: Ethylene.
| Year | Total | Chemicals |
|---|---|---|
| 2019 | 377.6K lbs | 8 |
| 2020 | 70.6K lbs | 8 |
| 2021 | 118.8K lbs | 8 |
| 2022 | 101.2K lbs | 8 |
| 2023 | 79.2K lbs | 8 |
| 2024 | 79.1K lbs | 8 |
Chemical Releases
Aggregated across all reporting years (2019–2024). 3 of 10 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Ethylene | 406.2K lbs | - |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 316.2K lbs | - |
| Manganese And Manganese Compounds | 47.1K lbs | - |
| Zinc compounds | 32.4K lbs | - |
| Nickel compounds | 17.6K lbs | Carcinogen |
| Lead compounds | 3.1K lbs | - |
| Nickel And Nickel Compounds | 2.2K lbs | Carcinogen |
| Benzene | 1.4K lbs | Carcinogen |
| Lead And Lead Compounds | 342 lbs | - |
| Sodium nitrite | 0 lbs | - |
Uss Mon Valley Works - Irvin Plant · AIR-pathway site
Nearest TRI Facilities to Uss Mon Valley Works - Irvin Plant
Closest other reporters in Pennsylvania - including Liberty Pultrusions, Lafarge - Duquesne Slag, Tech Met Inc., ordered by distance.
Showing 8 of 1,009 other reporting facilities in Pennsylvania.
Similar Primary Metals Facilities
Other Primary Metals facilities with similar total release volumes (±80%), outside Pennsylvania - e.g. Mueller Co., Real Alloy Specification LLC, Basf Corp.
Compare beyond Pennsylvania
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Uss Mon Valley Works - Irvin Plant on cumulative reported pounds (747.4K lbs) and distinct chemical count (10). Release-pound peers include M. Argueso & Co. Inc. (d.b.a. Paramelt), Equistar Chemicals Lp-Matagorda Facility, Celanese Emulsions Enoree Plant. Chemical-count peers include Harris Paints Corp., Saint Thomas Bulk Terminal, Total Guaynabo Bulk Terminal. Neighborhoods are forced disjoint so each axis surfaces a different set of sites.
Similar reported release pounds
Nearest out-of-state reporters (≥1,000 lbs) by absolute TRI pounds, not same-industry or same-county neighbors.
- M. Argueso & Co. Inc. (d.b.a. Paramelt) Cleveland, OH · Chemicals 748.2K lbs reported
- Equistar Chemicals Lp-Matagorda Facility Bay City, TX · Chemicals 746.2K lbs reported
- Celanese Emulsions Enoree Plant Enoree, SC · Chemicals 748.6K lbs reported
- Midamerican Energy Co George Neal North Sergeant Bluff, IA · Electric Utilities 749.1K lbs reported
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
Other US Steel Corp Facilities
Same-parent TRI sites ranked by reported releases - including Uss Gary Works, Uss Mon Valley Works - Edgar Thomson Plant, Uss-Clairton Plant.
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
On this page the largest disclosed chemicals include Ethylene, Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Manganese And Manganese Compounds, Zinc compounds; nearby reporters include Liberty Pultrusions. Uss Mon Valley Works - Irvin Plant stamps MID volume · AIR pathway · CARC-LEAN carcinogen-lbs on this Form-R extract. Totals are self-reported estimates under EPCRA §313, not measured stack emissions or a health-risk score.
Use and verify this record
This Uss Mon Valley Works - Irvin Plant TRI extract (MID · AIR · CARC-LEAN · lead Ethylene) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Uss Mon Valley Works - Irvin Plant totals are self-reported EPCRA §313 estimates for West Mifflin, PA, latest year 2023. Form-R rows span 2019–2024 (6 years). NAICS 331221 · Primary Metals. 1.6% of Allegheny TRI pounds in this extract. Nearest ABS peer: M. Argueso & Co. Inc. (d.b.a. Paramelt) (Δ 855 lbs). Pounds ≠ exposure.
Uss Mon Valley Works - Irvin Plant stamps MID volume · AIR pathway · CARC-LEAN · lead Ethylene. PlainEnviro renders this EPA Form-R extract from its pipeline; no figure is typed in by an editor. Corrections: editorial policy.
All federal data sources used on this page
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program reference - how chemicals and reported releases are counted. epa.gov
- EPA Facility Registry Service - facility location and identity. epa.gov
- EPA ECHO - regulatory and compliance context. epa.gov
- EPA Envirofacts - the EPA data warehouse exposing these datasets. epa.gov