Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
NORTHROP GRUMMAN SYSTEMS CORP - PROMONTORY
9160 N HWY 83, PROMONTORY, UT, 84307
Parent company: NORTHROP GRUMMAN CORP
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 | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1,1,1-Trichloroethane | Aluminum oxide (fibrous forms) | Aluminum (fume or dust) | Xylene (mixed isomers) | Total (lbs) |
| 2024 | 70,671 | — | — | 158,995 | — | 230,771 |
| 2023 | 52,223 | — | — | 34,339 | — | 87,217 |
| 2022 | 318,027 | — | — | 25,402 | — | 343,876 |
| 2021 | 36,805 | — | — | 37,162 | — | 73,972 |
| 2020 | 400,168 | — | — | 36,893 | — | 437,062 |
| 2019 | 248,756 | — | — | 39,917 | — | 288,673 |
| 2018 | 74,624 | — | — | 38,102 | — | 144,775 |
| 2017 | 46,440 | — | — | 32,357 | — | 78,797 |
| 2016 | 316,010 | — | — | 47,779 | — | 363,789 |
| 2015 | 341,512 | — | — | 26,006 | — | 367,518 |
| 2014 | — | — | — | 35,381 | — | 35,381 |
| 2013 | — | — | — | 25,704 | — | 25,704 |
| 2012 | — | — | — | 58,363 | — | 58,363 |
| 2011 | 507,618 | — | — | 81,043 | — | 588,661 |
| 2010 | 781,602 | — | — | 87,999 | — | 869,601 |
| 2009 | 866,000 | 10,410 | — | 152,702 | — | 1,029,112 |
| 2008 | 1,524,239 | 27,400 | — | 160,910 | — | 1,712,549 |
| 2007 | 1,802,707 | 19,348 | — | 126,437 | — | 1,948,492 |
| 2006 | 1,659,275 | 9,636 | — | 209,062 | — | 1,887,741 |
| 2005 | 1,724,341 | 10,636 | — | 99,888 | — | 1,850,865 |
| 2004 | 846,941 | 25,440 | — | 151,000 | — | 1,023,381 |
| 2003 | 988,491 | 25,190 | — | 141,464 | — | 1,155,145 |
| 2002 | 540,000 | 37,000 | — | — | — | 577,000 |
| 2001 | 780,000 | 33,000 | — | — | — | 813,000 |
| 2000 | 1,297,480 | 34,000 | — | — | — | 1,331,480 |
| 1999 | 590,000 | 100,000 | — | — | — | 690,000 |
| 1998 | 740,000 | 97,000 | — | — | — | 1,012,000 |
| 1997 | 490,000 | 91,000 | — | — | — | 581,000 |
| 1996 | 190,000 | 140,000 | — | — | — | 330,000 |
| 1995 | 460,000 | 500,000 | — | — | 9,600 | 978,600 |
| 1994 | 450,000 | 270,000 | — | — | 16,000 | 744,820 |
| 1993 | 750,000 | 370,000 | — | — | 33,000 | 1,205,500 |
| 1992 | 790,000 | 450,000 | — | — | 46,000 | 1,359,100 |
| 1991 | 960,000 | 1,280,000 | — | — | 100,000 | 2,488,000 |
| 1990 | 1,400,000 | 700,000 | — | — | 25,000 | 2,213,400 |
| 1989 | 1,300,000 | 620,000 | — | — | 18,900 | 2,031,900 |
| 1988 | 1,400,000 | — | 2,100,000 | 1,400 | 28,000 | 3,657,550 |
| 1987 | 810,000 | — | 1,400,000 | 1,700 | 23,000 | 2,246,700 |
▎ 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.