Onsemi – Emissions Trend
Hopewell Junction, NY · 2019–2024 · Parent: Semiconductor Components Industries LLC
This page assembles 6 consecutive years of EPA Toxics Release Inventory Form R filings for Onsemi, spanning 2019–2024. 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 709.8K in 2019 and closed at 566.6K in 2024 – a decrease of 20.2% 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 Nitrate compounds (water dissociable; reportable only when in aqueous solution) at 3.5M, followed by Copper And Copper Compounds at 87.5K.
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 computers and electronic products facility.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Onsemi's total reported releases fell from 672.1 thousand lb in 2022 to 536.6 thousand lb in 2023, based on EPA TRI filings.
- Onsemi's water releases fell from 620.2 thousand lb in 2022 to 487.0 thousand lb in 2023, based on EPA TRI filings.
- Onsemi's off-site transfers fell from 27.0 thousand lb in 2022 to 22.5 thousand lb in 2023, based on EPA TRI filings.
- Onsemi's air releases rose from 24.9 thousand lb in 2022 to 27.0 thousand lb in 2023, based on EPA TRI filings.
Total Releases by Category
Year-over-Year Comparison
| Year | Total | Chemicals | YoY Change |
|---|---|---|---|
| 2019 | 709.8K lbs | 12 | - |
| 2020 | 690.6K lbs | 11 | -2.7% |
| 2021 | 617.1K lbs | 11 | -10.6% |
| 2022 | 672.1K lbs | 12 | +8.9% |
| 2023 | 536.6K lbs | 12 | -20.2% |
| 2024 | 566.6K lbs | 12 | +5.6% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Total |
|---|---|---|---|---|---|---|---|
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 664.8K | 640.8K | 569.2K | 619.8K | 486.7K | 536.1K | 3.5M |
| Copper And Copper Compounds | 18.9K | 18.4K | 22.8K | 27.4K | - | - | 87.5K |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 10.0K | 15.5K | 8.6K | 10.7K | 8.9K | 10.1K | 63.8K |
| Ammonia | 4.7K | 4.7K | 4.8K | 3.2K | 7.5K | 7.4K | 32.3K |
| Ethylene glycol | 4.4K | 4.4K | 4.4K | 4.5K | 4.5K | 4.4K | 26.6K |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3.4K | 3.7K | 3.6K | 3.3K | 3.2K | 5.7K | 22.9K |
| Copper compounds | - | - | - | - | 22.7K | - | 22.7K |
| Hydrogen fluoride | 2.0K | 1.0K | 1.2K | 1.8K | 1.7K | 1.7K | 9.4K |
| Nitric acid | 1.0K | 1.6K | 2.0K | 1.0K | 860 | 940 | 7.4K |
| N-Methyl-2-pyrrolidone | 400 | 400 | 400 | 410 | 380 | 355 | 2.3K |
| Ozone | 16 | 16 | 16 | 16 | 87 | 12 | 163 |
| Lead And Lead Compounds | 147 | - | - | - | - | - | 147 |
| Fluorine | 30 | 25 | 25 | 30 | 4 | 3 | 117 |
| Polycyclic aromatic compounds | - | - | - | 3 | 3 | 3 | 9 |
| Benzo[g,h,i]perylene | - | - | - | - | - | - | 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
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Read our methodology - how this data is sourced, computed, and verified.