Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
RM HESKETT STATION
2025 38TH ST, MANDAN, ND, 58554
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 | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | Manganese compounds | Zinc compounds | Barium | Total (lbs) |
| 2022 | 4,242 | 18,061 | 3,267 | 18,006 | — | 44,450 |
| 2021 | 39,220 | 181,713 | 32,785 | 107,882 | — | 370,464 |
| 2020 | 37,858 | 166,939 | 30,236 | 91,315 | — | 335,534 |
| 2019 | 31,841 | 158,609 | 28,570 | 83,236 | — | 309,442 |
| 2018 | 35,983 | 177,961 | 32,123 | 73,486 | — | 326,825 |
| 2017 | 35,653 | 163,364 | 29,488 | 67,298 | — | 301,136 |
| 2016 | 22,701 | 167,741 | 30,278 | 67,413 | — | 294,299 |
| 2015 | 25,617 | 148,245 | 32,312 | 51,896 | — | 267,614 |
| 2014 | 306,036 | 196,766 | 35,506 | — | — | 542,155 |
| 2013 | 254,176 | 160,502 | 28,964 | — | — | 447,223 |
| 2012 | 307,611 | 171,885 | 30,986 | — | — | 514,373 |
| 2011 | 290,282 | 178,988 | 17,430 | — | — | 491,565 |
| 2010 | 256,381 | 166,639 | 18,093 | — | — | 443,919 |
| 2009 | 308,938 | 202,374 | 22,078 | — | — | 536,799 |
| 2008 | 284,737 | 206,779 | 22,452 | — | — | 517,437 |
| 2007 | 305,919 | 225,045 | 24,449 | — | — | 559,205 |
| 2006 | 227,087 | 158,627 | 17,224 | — | — | 405,608 |
| 2005 | 306,758 | 214,162 | 23,248 | — | — | 547,770 |
| 2004 | 308,249 | 223,443 | 24,265 | — | — | 559,722 |
| 2003 | 314,422 | 189,192 | 20,540 | — | — | 527,349 |
| 2002 | 309,000 | 185,302 | 20,069 | — | — | 517,524 |
| 2001 | 324,000 | 211,502 | 23,078 | — | — | 562,151 |
| 2000 | 248,000 | 171,202 | 18,064 | — | — | 437,397 |
| 1999 | 320,000 | — | — | — | 293,108 | 645,612 |
| 1998 | — | — | — | — | 242,506 | 293,512 |
▎ 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.