Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
USAF PLANT 42 SITE 4 NORTHROP GRUMMAN SYSTEMS CORP
3520 E AVE M, PALMDALE, CA, 93550
Parent company: NA
Carcinogen
— 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 | Methyl isobutyl ketone | sec-Butyl alcohol | Total (lbs) | |||
| 2024 | 9,763 | 10,511 | 20,274 | |||
| 2023 | — | 11,512 | 11,512 | |||
| 2022 | 14,753 | 10,575 | 25,328 | |||
| 2021 | — | 11,439 | 11,439 | |||
| 2020 | 10,470 | — | 10,470 | |||
| 2019 | 21,222 | — | 21,222 | |||
| 2018 | 22,138 | — | 22,138 | |||
| 2017 | 19,361 | — | 19,361 | |||
| 2016 | 33,221 | — | 33,221 | |||
| 2015 | 23,663 | — | 23,663 | |||
| 2014 | 24,226 | — | 24,226 | |||
| 2013 | 16,550 | — | 16,550 | |||
| 2012 | 19,639 | — | 19,639 | |||
| 2011 | 13,795 | — | 13,795 | |||
| 2010 | 29,440 | — | 29,440 | |||
| 2009 | 34,002 | — | 34,002 | |||
| 2008 | 32,527 | — | 32,527 | |||
| 2007 | 28,190 | — | 28,190 | |||
| 2005 | 25,548 | — | 25,548 | |||
▎ 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.