Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
PERMALOK-A NORTHWEST PIPE CO
472 PAUL AVE, SAINT LOUIS, MO, 63135
Parent company: NORTHWEST PIPE CO
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 | Manganese | Total (lbs) | ||||
| 2023 | 89 | 89 | ||||
| 2022 | 160 | 160 | ||||
| 2021 | 159 | 159 | ||||
| 2020 | 158 | 158 | ||||
| 2019 | 158 | 158 | ||||
| 2018 | 66 | 66 | ||||
| 2017 | 33 | 33 | ||||
| 2016 | 250 | 250 | ||||
| 2015 | 250 | 250 | ||||
| 2014 | 100 | 100 | ||||
▎ 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.