Aluminum (fume or dust)
Aluminum (fume or dust) releases at Northrop Grumman Systems Corp - Promontory rose from 35k lb to 159k lb (4.6×) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Northrop Grumman Systems Corp - Promontory
Total reported releases 231k lb more than doubled year over year (+164%). Total releases concentrations have more than halved since 2010.
9160 N HWY 83, Promontory, Utah · 336415 · Transportation Equipment · operated by Northrop Grumman CORP
Anomaly engine
Notable Signals
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) at Northrop Grumman Systems Corp - Promontory have more than three-quarters since 2010 (through 2024).
Total reported releases
Total reported releases at Northrop Grumman Systems Corp - Promontory have more than halved since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Aluminum (fume or dust)
Aluminum (fume or dust) concentrations are up 17% 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 more than halved since 2010.
Polycyclic aromatic compounds
Polycyclic aromatic compounds concentrations have more than doubled since 2022.
Nitroglycerin
Nitroglycerin concentrations have more than doubled since 2021.
Dioxin and dioxin-like compounds
Dioxin and dioxin-like compounds volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (1 Census block groups, population-weighted demographics): a population of 1,394. Why we surface this →
37.3%
Low-income
24.5%
People of color
4.9%
Under age 5
15.1%
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.