Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
HUGHES MISSILE SYSTEMS CO
10900 E 4TH ST, ONTARIO, CA, 91730
Parent company: GENERAL MOTORS 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 | Freon 113 (CFC-113) | 1,1,1-Trichloroethane | Toluene | Total (lbs) | ||
| 1993 | 28,903 | 11,509 | — | 40,412 | ||
| 1992 | 37,898 | — | — | 37,898 | ||
| 1991 | 10,630 | — | — | 10,630 | ||
| 1990 | 13,145 | — | — | 13,145 | ||
| 1989 | 29,600 | 10,300 | — | 39,900 | ||
| 1988 | 92,700 | — | — | 92,700 | ||
| 1987 | — | — | 2,900 | 2,900 | ||
▎ 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.