Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
M-I LLC-ZAVALLA
207 CLAY PLANT RD, ZAVALLA, TX, 75980
Parent company: SCHLUMBERGER HOLDINGS CORP
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 | Chromium compounds (except for chromite ore mined in the Transvaal Region) | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Sodium hydroxide (solution) | Total (lbs) | ||
| 2016 | 10 | — | — | 10 | ||
| 2015 | 5 | — | — | 5 | ||
| 2014 | 7 | — | — | 7 | ||
| 2013 | 20 | — | — | 20 | ||
| 2012 | 21 | — | — | 21 | ||
| 2010 | 213 | — | — | 213 | ||
| 2009 | 20 | — | — | 20 | ||
| 2008 | 294 | — | — | 294 | ||
| 2007 | 250 | — | — | 250 | ||
| 2006 | 500 | — | — | 500 | ||
| 2005 | 500 | — | — | 500 | ||
| 2004 | 500 | — | — | 500 | ||
| 2003 | 500 | — | — | 500 | ||
| 2002 | 500 | — | — | 500 | ||
| 2001 | 500 | — | — | 500 | ||
| 2000 | 500 | — | — | 500 | ||
| 1999 | 500 | — | — | 500 | ||
| 1998 | 500 | — | — | 500 | ||
| 1997 | 100 | — | — | 100 | ||
| 1996 | 77 | — | — | 77 | ||
| 1995 | 500 | — | — | 500 | ||
| 1994 | 755 | 250 | — | 1,005 | ||
| 1993 | 255 | 250 | — | 505 | ||
| 1992 | 500 | 250 | — | 750 | ||
| 1991 | 1,000 | 250 | — | 1,250 | ||
| 1990 | 1,000 | 250 | — | 1,250 | ||
| 1989 | 500 | 250 | — | 750 | ||
| 1988 | 1,000 | — | — | 1,000 | ||
| 1987 | — | — | 250 | 250 | ||
▎ 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.