Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
P4 PRODUCTION LLC
2.5 MILES S COUNTY RD 50, ROCK SPRINGS, WY, 82901
Parent company: BAYER US HOLDING LP
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) | Lead compounds | Mercury compounds | Lead And Lead Compounds | Mercury And Mercury Compounds | Total (lbs) |
| 2024 | — | — | — | 28 | 0 | 28 |
| 2023 | — | — | — | 1 | 0 | 1 |
| 2022 | — | — | — | 1 | 0 | 1 |
| 2021 | — | — | — | 1 | 0 | 1 |
| 2020 | — | 1 | 0 | — | — | 1 |
| 2019 | — | — | — | 21 | 0 | 21 |
| 2018 | — | — | — | 1 | 0 | 1 |
| 2017 | — | 121 | 1 | — | — | 122 |
| 2016 | — | 129 | 1 | — | — | 130 |
| 2015 | — | 36 | 4 | — | — | 40 |
| 2014 | — | 17 | 0 | — | — | 17 |
| 2013 | — | 14 | 0 | — | — | 14 |
| 2012 | — | 14 | 0 | — | — | 14 |
| 2011 | — | 14 | 0 | — | — | 14 |
| 2010 | — | 18 | 0 | — | — | 18 |
| 2009 | — | 37 | 0 | — | — | 37 |
| 2008 | — | 38 | 0 | — | — | 38 |
| 2007 | — | 163 | 6 | — | — | 169 |
| 2006 | — | 151 | 7 | — | — | 158 |
| 2005 | — | 55 | 7 | — | — | 62 |
| 2004 | — | 156 | 7 | — | — | 163 |
| 2003 | — | 128 | 7 | — | — | 135 |
| 2002 | — | 95 | 7 | — | — | 101 |
| 2001 | — | 135 | 7 | — | — | 142 |
| 2000 | — | — | 7 | — | — | 7 |
| 1997 | 110,000 | — | — | — | — | 110,000 |
| 1996 | 100,000 | — | — | — | — | 100,000 |
| 1995 | 98,000 | — | — | — | — | 98,000 |
▎ 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.