Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
PURINA ANIMAL NUTRITION LLC - MASON CITY
1609 19TH ST SW, MASON CITY, IA, 50401
Parent company: LAND O LAKES 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 | Zinc compounds | Manganese compounds | Copper compounds | Total (lbs) | ||
| 2024 | 4 | — | — | 4 | ||
| 1997 | 46 | 10 | 2 | 58 | ||
| 1996 | 54 | 37 | 12 | 103 | ||
| 1994 | 25 | 25 | 5 | 55 | ||
| 1993 | 44 | 44 | 9 | 97 | ||
| 1992 | 43 | 43 | 9 | 95 | ||
| 1991 | 8 | 8 | 2 | 18 | ||
▎ 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.