Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
INTERGRAPH CORP
1 MADISON INDL PARK, HUNTSVILLE, AL, 358940001
Parent company: NA
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 | Freon 113 (CFC-113) | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Ammonia | Chlorine | Total (lbs) |
| 1995 | — | 500 | — | 500 | — | 1,000 |
| 1994 | — | 500 | 500 | — | — | 1,000 |
| 1993 | — | 500 | 500 | — | — | 1,000 |
| 1992 | — | 500 | 500 | — | — | 1,010 |
| 1991 | 6,969 | 500 | 500 | — | — | 7,995 |
| 1990 | 27,641 | 750 | — | 500 | 250 | 29,141 |
| 1988 | — | 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.