Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
COBURN OPTICAL INDUSTRIES
1701 S CHEROKEE, MUSKOGEE, OK, 74403
Parent company: PILKINGTON HOLDINGS 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 | Methyl ethyl ketone | Dichloromethane | 1,1,1-Trichloroethane | Manganese | Total (lbs) | |
| 1990 | 15,977 | — | — | 255 | 16,232 | |
| 1989 | 15,060 | 6,000 | — | — | 21,060 | |
| 1988 | — | 6,600 | 9,400 | — | 16,000 | |
| 1987 | — | 6,000 | — | — | 6,000 | |
▎ 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.