Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
KNIFE RIVER CASPER
1461 BRYAN STOCK TRL, CASPER, WY, 82601
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 | Mercury And Mercury Compounds | Benzo[g,h,i]perylene | Total (lbs) |
| 2024 | 0 | 14 | 0 | — | — | 14 |
| 2023 | 0 | 22 | — | — | — | 22 |
| 2022 | 0 | 88 | 0 | — | — | 88 |
| 2021 | 0 | — | 0 | — | — | 0 |
| 2020 | 0 | — | — | — | — | 0 |
| 2019 | 1 | — | 0 | 0 | — | 1 |
| 2018 | 0 | 5 | — | — | — | 6 |
| 2017 | 0 | — | — | — | — | 0 |
| 2016 | 0 | — | — | — | 0 | 0 |
| 2015 | 0 | — | — | — | — | 0 |
| 2014 | 0 | — | — | — | — | 0 |
| 2013 | 0 | — | — | — | — | 0 |
| 2012 | 0 | — | — | — | — | 0 |
| 2011 | 0 | — | — | — | — | 0 |
| 2010 | 937 | — | — | — | — | 937 |
| 2009 | 492 | — | — | — | — | 492 |
| 2008 | 578 | — | — | — | — | 578 |
| 2007 | 900 | — | — | — | — | 900 |
▎ 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.