Nucor Steel Marion Inc – Emissions Trend
Marion, OH · 2019–2023 · Parent: Nucor Corp
This page assembles 5 consecutive years of EPA Toxics Release Inventory Form R filings for Nucor Steel Marion Inc, spanning 2019–2023. Each annual total aggregates on-site air emissions, surface-water discharges, land disposal, and off-site transfers reported by the facility under EPCRA Section 313, which requires disclosure whenever a listed chemical is manufactured, processed, or otherwise used above threshold quantities.
Reported releases opened at 208.2K in 2019 and closed at 169.2K in 2023 – a decrease of 18.7% over the window. The chart below stacks the four TRI release media (air, water, land, off-site) and overlays the yearly total. The top contributor by cumulative mass is Zinc compounds at 353.7K, followed by Manganese compounds at 295.1K.
Because TRI figures are estimated, not metered, year-over-year deltas can reflect methodology revisions, ownership changes, or shifts in what a facility classifies as reportable, not only physical emission changes. Treat the trajectory as a disclosure record, and cross-reference with the EPA Enforcement and Compliance History Online (ECHO) system for the fuller regulatory picture on this primary metals facility.
Total Releases by Category
Year-over-Year Comparison
| Year | Total | Chemicals | YoY Change |
|---|---|---|---|
| 2019 | 208.2K lbs | 7 | - |
| 2020 | 216.3K lbs | 7 | +3.9% |
| 2021 | 129.1K lbs | 7 | -40.3% |
| 2022 | 259.5K lbs | 8 | +101.0% |
| 2023 | 169.2K lbs | 8 | -34.8% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | Total |
|---|---|---|---|---|---|---|
| Zinc compounds | 79.3K | 65.6K | 52.2K | 84.4K | 72.1K | 353.7K |
| Manganese compounds | 101.4K | 124.3K | - | - | 69.4K | 295.1K |
| Manganese And Manganese Compounds | - | - | 58.1K | 126.0K | - | 184.0K |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 15.3K | 16.1K | - | - | 12.3K | 43.7K |
| Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | - | - | 9.2K | 20.1K | - | 29.2K |
| Lead And Lead Compounds | - | - | 6.2K | 20.7K | - | 26.9K |
| Lead compounds | 3.6K | 3.4K | - | - | 10.2K | 17.2K |
| Copper compounds | 7.0K | 5.4K | - | - | 4.1K | 16.5K |
| Copper And Copper Compounds | - | - | 2.8K | 6.4K | - | 9.2K |
| Nickel compounds | 1.5K | 1.3K | - | - | 1.0K | 3.9K |
| Nickel And Nickel Compounds | - | - | 540 | 1.9K | - | 2.4K |
| Mercury compounds | 97 | 102 | - | - | 29 | 228 |
| Mercury And Mercury Compounds | - | - | 119 | 34 | - | 153 |
| Dioxin and dioxin-like compounds | - | - | - | 0 | 0 | 1 |
About This Data
Trend data is sourced from the EPA Toxic Release Inventory (TRI). Facilities report annually. Release quantities are self-reported estimates. Year-over-year changes may reflect changes in production, pollution control measures, reporting methodology, or chemical thresholds.
A decrease in reported releases does not necessarily indicate improved environmental performance, as it may reflect production cutbacks, facility closures, or changes in reporting requirements. Similarly, increases may reflect expanded production rather than degraded environmental practices.
Frequently Asked Questions
Is Nucor Steel Marion Inc getting cleaner or dirtier? ▼
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Read our methodology - how this data is sourced, computed, and verified.