Hydrogen cyanide
Hydrogen cyanide releases at Heidelberg Materials US Cement LLC rose from 45k lb to 139k lb (3.1×) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Heidelberg Materials US Cement LLC
Total reported releases 313k lb more than tripled year over year (+284%). Total releases concentrations have more than doubled since 2023.
200 MILL CREEK RD, Mitchell, Indiana · 327310 · Nonmetallic Mineral Product · operated by Heidelberg Materials US INC
Anomaly engine
Notable Signals
Chemicals reported · most recent year
What This Facility Releases
Hydrogen cyanide
Hydrogen cyanide concentrations have more than doubled since 2023.
Formaldehyde
Formaldehyde volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Acetaldehyde
Acetaldehyde volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Aluminum (fume or dust)
Aluminum (fume or dust) concentrations are up 25% since 2023.
Ammonia
Ammonia concentrations are up 46% since 2023.
Copper And Copper Compounds
Copper And Copper Compounds concentrations are up 16% since 2023.
Manganese compounds
Manganese compounds concentrations are up 25% since 2023.
Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)
Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) concentrations are up 25% since 2023.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (5 Census block groups, population-weighted demographics): a population of 4,018. Why we surface this →
37.0%
Low-income
4.1%
People of color
4.2%
Under age 5
21.3%
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.