Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
KNIFE RIVER CHEYENNE
4875 S INDUSTRIAL SERVICE RD, CHEYENNE, WY, 82007
Parent company: MDU RESOURCES GROUP INC
Carcinogen
PBT
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| All values in pounds (lbs) | ||||||
|---|---|---|---|---|---|---|
| Year | Polycyclic aromatic compounds | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | Lead And Lead Compounds | Lead compounds | Mercury And Mercury Compounds | Total (lbs) |
| 2024 | 0 | 120 | 0 | — | 0 | 120 |
| 2023 | 0 | 100 | 0 | — | 0 | 100 |
| 2022 | 0 | 130 | 0 | — | — | 130 |
| 2021 | 0 | 270 | — | 0 | — | 271 |
| 2020 | 0 | — | — | 0 | — | 1 |
| 2019 | 0 | 700 | 0 | — | — | 701 |
| 2018 | 0 | 67 | — | — | — | 67 |
| 2017 | 0 | — | — | — | — | 0 |
| 2016 | 0 | — | — | — | — | 0 |
| 2015 | 0 | 218 | — | — | — | 218 |
| 2014 | 0 | 250 | — | — | — | 250 |
| 2013 | 0 | 249 | — | — | — | 249 |
| 2012 | 0 | 149 | — | — | — | 149 |
| 2011 | 0 | 356 | — | — | — | 356 |
| 2010 | 847 | — | — | — | — | 847 |
| 2009 | 1,035 | — | — | — | — | 1,035 |
| 2008 | 509 | — | — | — | — | 509 |
| 2007 | 1,035 | — | — | — | — | 1,035 |
▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.