US Steel Corp Midwest Plant – Emissions Trend
Portage, IN · 2019–2023 · Parent: US Steel Corp
This page assembles 5 consecutive years of EPA Toxics Release Inventory Form R filings for US Steel Corp Midwest Plant, spanning 2019–2023. Each annual total aggregates on-site air emissions, surface-water discharges, land disposal, and off-site transfers reported by the facility under EPCRA Section 313, which requires disclosure whenever a listed chemical is manufactured, processed, or otherwise used above threshold quantities.
Reported releases opened at 477.1K in 2019 and closed at 189.8K in 2023 – a decrease of 60.2% over the window. The chart below stacks the four TRI release media (air, water, land, off-site) and overlays the yearly total. The top contributor by cumulative mass is Chromium compounds (except for chromite ore mined in the Transvaal Region) at 1.7M, followed by Manganese at 42.0K.
Because TRI figures are estimated, not metered, year-over-year deltas can reflect methodology revisions, ownership changes, or shifts in what a facility classifies as reportable, not only physical emission changes. Treat the trajectory as a disclosure record, and cross-reference with the EPA Enforcement and Compliance History Online (ECHO) system for the fuller regulatory picture on this primary metals facility.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- US Steel Corp Midwest Plant's total reported releases rose from 164.0 thousand lb in 2022 to 189.8 thousand lb in 2023, based on EPA TRI filings.
- US Steel Corp Midwest Plant's air releases rose from 46 lb in 2022 to 4.5 thousand lb in 2023, based on EPA TRI filings.
- US Steel Corp Midwest Plant's off-site transfers rose from 144.8 thousand lb in 2022 to 166.8 thousand lb in 2023, based on EPA TRI filings.
- US Steel Corp Midwest Plant's chemicals reported rose from 7 in 2022 to 8 in 2023, based on EPA TRI filings.
Total Releases by Category
Year-over-Year Comparison
| Year | Total | Chemicals | YoY Change |
|---|---|---|---|
| 2019 | 477.1K lbs | 5 | - |
| 2020 | 429.9K lbs | 5 | -9.9% |
| 2021 | 476.3K lbs | 5 | +10.8% |
| 2022 | 164.0K lbs | 7 | -65.6% |
| 2023 | 189.8K lbs | 8 | +15.7% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | Total |
|---|---|---|---|---|---|---|
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 474.6K | 424.3K | 459.4K | 144.0K | 166.1K | 1.7M |
| Manganese | 865 | 4.2K | 13.4K | 12.0K | 11.6K | 42.0K |
| Zinc compounds | 881 | 753 | 2.2K | 2.7K | 2.3K | 8.9K |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | - | - | - | 4.2K | 4.3K | 8.5K |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | - | - | - | - | 4.4K | 4.4K |
| Nickel | 600 | 532 | 978 | 973 | 1.0K | 4.1K |
| Lead And Lead Compounds | 167 | 125 | 210 | 100 | 112 | 714 |
| Sodium nitrite | - | - | - | - | - | 0 |
About This Data
Trend data is sourced from the EPA Toxic Release Inventory (TRI). Facilities report annually. Release quantities are self-reported estimates. Year-over-year changes may reflect changes in production, pollution control measures, reporting methodology, or chemical thresholds.
A decrease in reported releases does not necessarily indicate improved environmental performance, as it may reflect production cutbacks, facility closures, or changes in reporting requirements. Similarly, increases may reflect expanded production rather than degraded environmental practices.
Frequently Asked Questions
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Read our methodology - how this data is sourced, computed, and verified.