Sierra Aluminum Co Plant II – Emissions Trend
Fontana, CA · 2019–2023 · Parent: Sierra Aluminum Co
This page assembles 5 consecutive years of EPA Toxics Release Inventory Form R filings for Sierra Aluminum Co Plant II, 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 11.0K in 2019 and closed at 8.6K in 2023 – a decrease of 22.1% 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 Xylene (mixed isomers) at 277.9K, followed by Ethylbenzene at 83.7K.
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.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Sierra Aluminum Co Plant II's total reported releases fell from 297.1 thousand lb in 2022 to 8.6 thousand lb in 2023, based on EPA TRI filings.
- Sierra Aluminum Co Plant II's off-site transfers fell from 294.9 thousand lb in 2022 to 7.3 thousand lb in 2023, based on EPA TRI filings.
- Sierra Aluminum Co Plant II's air releases fell from 2.2 thousand lb in 2022 to 1.3 thousand lb in 2023, based on EPA TRI filings.
- Sierra Aluminum Co Plant II's chemicals reported fell from 9 in 2022 to 7 in 2023, based on EPA TRI filings.
Total Releases by Category
Year-over-Year Comparison
| Year | Total | Chemicals | YoY Change |
|---|---|---|---|
| 2019 | 11.0K lbs | 8 | - |
| 2020 | 29.7K lbs | 8 | +169.2% |
| 2021 | 44.3K lbs | 8 | +49.1% |
| 2022 | 297.1K lbs | 9 | +570.3% |
| 2023 | 8.6K lbs | 7 | -97.1% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | Total |
|---|---|---|---|---|---|---|
| Xylene (mixed isomers) | 3.4K | 18.7K | 30.1K | 223.9K | 1.8K | 277.9K |
| Ethylbenzene | 1.7K | 5.5K | 8.9K | 67.1K | 464 | 83.7K |
| Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 3.4K | 4.1K | 3.6K | 4.3K | 4.7K | 20.2K |
| Certain glycol ethers | 1.8K | 1.1K | 1.3K | 925 | 891 | 5.9K |
| Toluene | 627 | 340 | 357 | 663 | 721 | 2.7K |
| Ethyl acrylate | 54 | 16 | 27 | 54 | 82 | 233 |
| 1-Propanesulfonic acid, 2-methyl-, 2-[[1-oxo-3-[(γ-ω-perfluoro-C4-16-alkyl)thio]propyl]amino] derivs., sodium salts | - | - | - | 80 | - | 80 |
| Lead | 11 | 13 | 17 | 17 | 16 | 74 |
| Hydrogen fluoride | - | - | - | - | - | 0 |
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 Sierra Aluminum Co Plant II getting cleaner or dirtier? ▼
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Read our methodology - how this data is sourced, computed, and verified.