Ammonia
Ammonia at Simplot Phosphates LLC have more than doubled since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Simplot Phosphates LLC
Total reported releases 2.4M lb rose modestly year over year (+12%). Total releases concentrations are up 17% since 2010.
515 S HWY 430, Rock Springs, Wyoming · 325312 · Chemicals · operated by J R Simplot Co
Anomaly engine
Notable Signals
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) releases at Simplot Phosphates LLC rose from 29k lb to 50k lb between 2023 and 2024.
Chlorine
Chlorine releases at Simplot Phosphates LLC fell from 22k lb to 8k lb (61% lower) between 2023 and 2024.
Chlorine
Chlorine at Simplot Phosphates LLC have more than three-quarters since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Hydrogen fluoride
Hydrogen fluoride concentrations are up 10% since 2010.
Chromium compounds (except for chromite ore mined in the Transvaal Region)
Chromium compounds (except for chromite ore mined in the Transvaal Region) concentrations are up 23% since 2010.
Zinc compounds
Zinc compounds concentrations are roughly unchanged from 2010.
Ammonia
Ammonia concentrations have more than doubled since 2010.
Barium compounds (except for barium sulfate (CAS No. 7727-43-7))
Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) concentrations are up 12% 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 are up 71% since 2010.
Manganese compounds
Manganese compounds concentrations are up 41% since 2010.
Vanadium compounds
Vanadium compounds concentrations are up 29% since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (14 Census block groups, population-weighted demographics): a population of 18,719. Why we surface this →
27.0%
Low-income
26.0%
People of color
6.5%
Under age 5
11.9%
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.