Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
ALLIANT TECHSYSTEMS INC HOPKINS FACILITY
600 2ND ST NE, HOPKINS, MN, 553438384
Parent company: ALLIANT TECHSYSTEMS INC
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) | 1,1,1-Trichloroethane | Total (lbs) | |||
| 1992 | 22,250 | — | 22,250 | |||
| 1991 | 42,250 | 6,450 | 48,700 | |||
| 1990 | 44,250 | 10,050 | 54,300 | |||
| 1989 | 70,350 | 15,750 | 86,100 | |||
| 1988 | 62,150 | — | 62,150 | |||
▎ 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.