Nucor Steel Decatur LLC – Emissions Trend
Trinity, AL · 2019–2023 · Parent: Nucor Corp
This page assembles 5 consecutive years of EPA Toxics Release Inventory Form R filings for Nucor Steel Decatur LLC, 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 254.5K in 2019 and closed at 230.8K in 2023 – a decrease of 9.3% 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 Manganese And Manganese Compounds at 733.9K, followed by Zinc compounds at 296.3K.
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 | 254.5K lbs | 9 | - |
| 2020 | 225.8K lbs | 10 | -11.3% |
| 2021 | 207.8K lbs | 11 | -8.0% |
| 2022 | 381.1K lbs | 11 | +83.4% |
| 2023 | 230.8K lbs | 11 | -39.4% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | Total |
|---|---|---|---|---|---|---|
| Manganese And Manganese Compounds | 168.7K | 138.6K | 145.8K | 280.9K | - | 733.9K |
| Zinc compounds | 69.6K | 74.9K | 30.9K | 55.1K | 65.8K | 296.3K |
| Manganese compounds | - | - | - | - | 136.1K | 136.1K |
| Vanadium compounds | 2.7K | 2.2K | 4.9K | 9.3K | 7.6K | 26.7K |
| Nonylphenol Ethoxylates | - | - | 11.9K | 13.4K | - | 25.3K |
| Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 4.9K | 3.0K | 5.7K | 10.4K | - | 24.0K |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | - | - | - | - | 12.4K | 12.4K |
| Copper And Copper Compounds | 4.0K | 3.4K | 3.6K | - | - | 11.0K |
| Nickel And Nickel Compounds | - | - | 4.1K | 6.8K | - | 10.9K |
| Nickel compounds | 2.9K | 2.5K | - | - | 3.2K | 8.6K |
| Copper compounds | - | - | - | 3.9K | 3.7K | 7.6K |
| Lead And Lead Compounds | 1.5K | - | 794 | 978 | 1.3K | 4.5K |
| Lead compounds | - | 1.2K | - | - | - | 1.2K |
| Polycyclic aromatic compounds | 123 | 101 | 127 | 106 | 107 | 562 |
| Mercury compounds | 106 | 102 | - | - | 194 | 401 |
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 Decatur LLC getting cleaner or dirtier? ▼
What time period does this trend data cover? ▼
Read our methodology - how this data is sourced, computed, and verified.