Phillips 66 Ponca City Site – Emissions Trend
Ponca City, OK · 2019–2023 · Parent: Phillips 66 Co
This page assembles 5 consecutive years of EPA Toxics Release Inventory Form R filings for Phillips 66 Ponca City Site, 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 460.3K in 2019 and closed at 463.2K in 2023 – a flat trend of 0.6% 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 Hydrogen cyanide at 345.8K, followed by n-Hexane at 335.0K.
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 petroleum facility.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Phillips 66 Ponca City Site's total reported releases rose from 328.8 thousand lb in 2022 to 463.2 thousand lb in 2023, based on EPA TRI filings.
- Phillips 66 Ponca City Site's off-site transfers rose from 18.3 thousand lb in 2022 to 143.2 thousand lb in 2023, based on EPA TRI filings.
- Phillips 66 Ponca City Site's land releases rose from 2.0 thousand lb in 2022 to 2.5 thousand lb in 2023, based on EPA TRI filings.
- Phillips 66 Ponca City Site's water releases rose from 2.9 thousand lb in 2022 to 3.1 thousand lb in 2023, based on EPA TRI filings.
Total Releases by Category
Year-over-Year Comparison
| Year | Total | Chemicals | YoY Change |
|---|---|---|---|
| 2019 | 460.3K lbs | 36 | - |
| 2020 | 368.5K lbs | 37 | -19.9% |
| 2021 | 401.1K lbs | 37 | +8.8% |
| 2022 | 328.8K lbs | 35 | -18.0% |
| 2023 | 463.2K lbs | 35 | +40.9% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | Total |
|---|---|---|---|---|---|---|
| Hydrogen cyanide | 75.9K | 65.1K | 65.6K | 70.4K | 68.9K | 345.8K |
| n-Hexane | 69.3K | 66.5K | 68.3K | 64.0K | 66.9K | 335.0K |
| Toluene | 67.5K | 53.8K | 64.5K | 43.5K | 43.2K | 272.5K |
| Xylene (mixed isomers) | 50.6K | 39.9K | 47.7K | 29.5K | 30.2K | 198.0K |
| Cyclohexane | 28.2K | 24.1K | 41.7K | 24.3K | 26.1K | 144.4K |
| Lead And Lead Compounds | 1 | 3 | 22 | - | 139.3K | 139.3K |
| Benzene | 35.6K | 27.1K | 29.6K | 13.7K | 16.3K | 122.3K |
| Ammonia | 14.3K | 13.0K | 16.8K | 12.6K | 12.2K | 68.9K |
| Propylene | 26.8K | 12.5K | 9.9K | 9.5K | 8.3K | 66.9K |
| Hydrogen sulfide | 7.5K | 20.7K | 5.6K | 6.8K | 15.5K | 56.1K |
| Ethylbenzene | 13.0K | 9.2K | 10.0K | 6.2K | 9.4K | 47.9K |
| Naphthalene | 7.8K | 7.3K | 11.7K | 6.0K | 4.6K | 37.4K |
| Methanol | 7.0K | 6.9K | 6.9K | 6.9K | 6.6K | 34.3K |
| 1,2,4-Trimethylbenzene | 10.0K | 9.0K | 8.6K | 4.6K | 1.8K | 33.9K |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 31.2K | - | - | - | - | 31.2K |
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 Phillips 66 Ponca City Site getting cleaner or dirtier? ▼
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Read our methodology - how this data is sourced, computed, and verified.