Hardin Generating Station
Total reported releases 114k lb held roughly steady year over year (-0%). Total releases concentrations have fallen 50% since 2010.
643 INDUSTRIAL PARK RD, Hardin, Montana · 221112 · Electric Utilities · operated by Rocky Mountain Power LLC
Notable Signals
No notable signals at this facility for the current reporting year. See chemicals and equity context below for the full picture.
What This Facility Releases
Barium And Barium Compounds
Barium And Barium Compounds concentrations have fallen 48% since 2010.
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) concentrations have fallen 34% since 2010.
Manganese
Manganese concentrations have fallen 48% since 2021.
Copper
Copper concentrations have fallen 44% since 2021.
Zinc compounds
Zinc compounds concentrations have more than halved since 2010.
Lead And Lead Compounds
Lead And Lead Compounds concentrations have more than halved since 2010.
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 34% since 2010.
Hydrogen fluoride
Hydrogen fluoride concentrations have fallen 34% since 2010.
Who Lives Next To This Facility
Within 3 miles of this facility (3 Census block groups, population-weighted demographics): a population of 3,865. Why we surface this →
Low-income
People of color
Under age 5
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.