Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
NOV DOWNHOLE CONROE
500 CONROE PARK W DR, CONROE, TX, 77303
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 | Nickel | Chromium | Copper | Manganese | Silver | Total (lbs) |
| 2024 | 473 | — | 171 | 154 | 404 | 1,203 |
| 2023 | 1,017 | 109 | — | — | — | 1,128 |
| 2022 | 1,299 | — | — | — | — | 1,299 |
| 2021 | 2,090 | 56 | — | — | — | 2,146 |
| 2020 | 5,540 | 625 | 293 | 4 | — | 6,462 |
| 2019 | 20 | 20 | — | 40 | — | 80 |
| 2018 | 11 | 1 | — | 156 | — | 168 |
| 2017 | 9 | — | — | 44 | — | 53 |
| 2016 | 19 | — | — | 13 | — | 32 |
▎ 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.