Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
NOV TUBOSCOPE NAVASOTA
9574 FM 1227, NAVASOTA, TX, 77868
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 | n-Butyl alcohol | Methyl ethyl ketone | Methyl isobutyl ketone | Toluene | Certain glycol ethers | Total (lbs) |
| 2015 | 9,237 | — | 6,323 | 2,194 | — | 17,754 |
| 2014 | 9,663 | — | 7,384 | 6,994 | — | 24,041 |
| 2013 | 16,200 | — | 7,741 | 7,449 | — | 31,390 |
| 2012 | 7,612 | — | 4,422 | 4,342 | — | 16,376 |
| 2011 | 4,045 | — | 679 | 716 | 409 | 5,849 |
| 2010 | 11,023 | — | 6,020 | 5,960 | 10,782 | 33,785 |
| 2009 | 8,498 | — | 4,264 | 4,297 | 11,152 | 28,211 |
| 2008 | 8,906 | — | 5,804 | 8,677 | 8,661 | 32,048 |
| 2007 | 15,000 | — | 11,150 | 12,300 | 16,142 | 54,592 |
| 2006 | 24,959 | — | 15,799 | 15,584 | — | 56,342 |
| 2005 | 19,149 | — | 12,354 | 11,517 | — | 43,020 |
| 2004 | 18,133 | — | 9,902 | 9,094 | — | 37,129 |
| 2003 | 13,275 | 23,288 | 6,049 | 4,762 | — | 47,374 |
| 2002 | 17,570 | 39,318 | — | — | — | 56,888 |
| 2001 | 16,504 | 33,370 | 8,080 | 8,080 | — | 66,034 |
| 2000 | 16,424 | 26,636 | 5,806 | — | — | 48,866 |
| 1999 | 12,000 | 29,400 | — | — | — | 41,400 |
| 1998 | 8,800 | 13,900 | — | — | — | 22,700 |
▎ 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.