Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) at US Steel Corp Midwest Plant have more than three-quarters since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
US Steel Corp Midwest Plant
Total reported releases 134k lb fell sharply year over year (-36%). Total releases concentrations have more than halved since 2010.
6300 US HWY 12, Portage, Indiana · 331221 · Primary Metals · operated by US Steel CORP
Anomaly engine
Notable Signals
Total reported releases
Total reported releases at US Steel Corp Midwest Plant have more than three-quarters since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Chromium compounds (except for chromite ore mined in the Transvaal Region)
Chromium compounds (except for chromite ore mined in the Transvaal Region) concentrations have fallen 35% since 2010.
Manganese
Manganese concentrations have more than doubled since 2013.
Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) concentrations have fallen 47% since 2010.
Sodium nitrite
Sodium nitrite volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) concentrations have more than halved since 2010.
Zinc compounds
Zinc compounds concentrations have more than halved since 2010.
Nickel
Nickel concentrations have more than doubled since 2016.
Lead And Lead Compounds
Lead And Lead Compounds concentrations have more than halved since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (11 Census block groups, population-weighted demographics): a population of 12,227. Why we surface this →
26.1%
Low-income
21.2%
People of color
7.2%
Under age 5
15.2%
Over age 64
Source: Census ACS 2018-2022 block-group demographics, population-weighted across the 3-mile buffer around this facility (from USEPA-clone/EJAM-open blockgroupstats). Indicator-level percentile and EJ-disparity scores are surfaced on the county page and the state page — they describe wider regional exposure burdens, not effects attributable to a single facility.
Source. EPA Toxics Release Inventory · retrieved 2026-05-07. Reporting year 2024. TRI is a federal public-domain dataset under 17 USC §105.
What this is not. TRI quantifies releases reported by the facility under EPCRA §313 — not ambient air or water concentrations measured at receptors. We do not attribute individual health outcomes to specific facilities; that exceeds what the data can support.