Heidelberg Materials US Cement LLC
Total reported releases 14k lb fell meaningfully year over year (-20%). Total releases concentrations have fallen 34% since 2010.
700 25TH ST, Mason City, Iowa · 327310 · Nonmetallic Mineral Product · operated by Heidelberg Materials US INC
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
Aluminum (fume or dust)
Aluminum (fume or dust) concentrations are roughly unchanged from 2023.
Ammonia
Ammonia concentrations have fallen 21% since 2020.
Lead And Lead Compounds
Lead And Lead Compounds concentrations have more than halved since 2010.
Manganese And Manganese Compounds
Manganese And Manganese Compounds concentrations have more than halved since 2012.
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 have more than halved since 2010.
Nickel And Nickel Compounds
Nickel And Nickel Compounds concentrations have more than halved since 2014.
Arsenic And Arsenic Compounds
Arsenic And Arsenic Compounds concentrations have more than halved since 2023.
Cadmium compounds
Cadmium compounds concentrations have more than halved since 2023.
Who Lives Next To This Facility
Within 3 miles of this facility (21 Census block groups, population-weighted demographics): a population of 19,204. 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.