Propylene
Propylene releases at Calumet Montana Refining Llc. fell from 37k lb to 16k lb (57% lower) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Calumet Montana Refining Llc.
Total reported releases 85k lb fell meaningfully year over year (-31%). Total releases concentrations have more than halved since 2010.
1900 10TH ST NE, Great Falls, Montana · 324110 · Petroleum · operated by Calumet INC
Anomaly engine
Notable Signals
Ammonia
Ammonia at Calumet Montana Refining Llc. have more than three-quarters since 2010 (through 2024).
Total reported releases
Total reported releases at Calumet Montana Refining Llc. have more than halved since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
n-Hexane
n-Hexane concentrations are roughly unchanged from 2010.
Propylene
Propylene concentrations are up 60% since 2010.
Ammonia
Ammonia concentrations have more than halved since 2010.
Ethylene
Ethylene concentrations have fallen 14% since 2010.
Toluene
Toluene concentrations have more than halved since 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have more than halved since 2010.
Hydrogen sulfide
Hydrogen sulfide concentrations have fallen 16% since 2012.
1,2,4-Trimethylbenzene
1,2,4-Trimethylbenzene 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 (42 Census block groups, population-weighted demographics): a population of 43,055. Why we surface this →
36.7%
Low-income
18.3%
People of color
6.0%
Under age 5
18.4%
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.