Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
NOV RIG SYSTEMS FM 529
11919 FM-529, HOUSTON, TX, 77041
Parent company: NATIONAL OILWELL VARCO LP
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 | Xylene (mixed isomers) | Propylene | Chromium | Nickel | Copper | Total (lbs) |
| 2024 | — | 1,059 | 46 | 45 | — | 1,150 |
| 2023 | — | — | 53 | 52 | — | 105 |
| 2019 | — | — | — | — | 5 | 5 |
| 2018 | — | — | — | — | 10 | 10 |
| 2016 | — | — | — | — | — | 0 |
| 2015 | 16,223 | — | — | — | — | 16,223 |
| 2014 | 16,265 | — | — | — | — | 16,265 |
| 2013 | 9,897 | — | — | — | — | 9,897 |
| 2012 | 11,846 | — | — | — | — | 11,846 |
| 2011 | 9,369 | — | — | — | — | 9,369 |
▎ 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.