Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
DUCOMMUN AERO STRUCTURES INC
801 ROYAL OAKS DR, MONROVIA, CA, 91016
Parent company: DUCOMMUN INC
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 | 1,1,1-Trichloroethane | Methyl ethyl ketone | Dichloromethane | Chloromethane | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Total (lbs) |
| 1999 | — | 9,621 | — | — | — | 9,621 |
| 1998 | 12,787 | 14,823 | — | — | — | 27,610 |
| 1997 | 54,190 | 21,501 | — | — | — | 75,691 |
| 1996 | 70,157 | 13,175 | — | — | — | 83,332 |
| 1995 | 69,905 | 12,925 | — | — | — | 82,830 |
| 1994 | 62,061 | — | — | — | 5 | 62,331 |
| 1993 | 5,280 | 940 | 163 | — | — | 6,405 |
| 1992 | 83,846 | — | 12,421 | — | 755 | 97,032 |
| 1991 | 123,978 | 24,422 | 20,357 | — | 771 | 169,638 |
| 1990 | 173,253 | 18,635 | — | 6,579 | 1,500 | 201,977 |
| 1989 | 131,150 | 25,495 | 34,522 | — | 1,500 | 196,167 |
| 1988 | 140,750 | 34,011 | — | — | 500 | 177,761 |
| 1987 | — | 12,853 | 15,576 | — | — | 28,929 |
▎ 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.