Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
NOV WELLBORE TECHNOLOGIES - DDS - WILLIS
10586 HWY 75 N, WILLIS, TX, 77378
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 | Trichloroethylene | Methyl isobutyl ketone | Xylene (mixed isomers) | Toluene | Ethylbenzene | Total (lbs) |
| 2016 | — | — | — | — | — | 78 |
| 2015 | — | 182 | 252 | — | — | 435 |
| 2014 | 1,119 | 4,445 | 3,699 | 2,307 | 1,048 | 12,617 |
| 2013 | — | 2,607 | 3,970 | 1,209 | — | 7,786 |
| 2012 | — | 3,336 | 1,371 | 1,518 | — | 6,289 |
| 2011 | 22,776 | — | 131 | — | — | 22,912 |
| 2010 | 14,012 | — | 116 | — | — | 14,131 |
| 2009 | 14,021 | — | 67 | — | — | 14,093 |
| 2008 | 12,716 | — | 71 | — | — | 12,791 |
| 2007 | 18,114 | — | 62 | — | — | 18,180 |
| 2006 | 14,127 | — | 162 | — | — | 14,293 |
| 2005 | 13,571 | — | 340 | — | — | 13,915 |
| 2004 | 12,950 | — | 220 | — | — | 13,174 |
| 2003 | 10,600 | — | — | — | — | 10,604 |
| 2002 | 11,078 | — | — | — | — | 11,082 |
| 2001 | 16,805 | — | — | — | — | 16,814 |
| 2000 | 14,063 | — | — | — | — | 14,068 |
| 1999 | 15,433 | — | — | — | — | 15,433 |
| 1998 | 11,400 | — | — | — | — | 11,400 |
▎ 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.