US Navy Portsmouth Naval Shipyard – Emissions Trend
Kittery, ME · 2019–2024 · Parent: US Department of Defense
This page assembles 6 consecutive years of EPA Toxics Release Inventory Form R filings for US Navy Portsmouth Naval Shipyard, 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 5.0K in 2019 and closed at 799 in 2024 – a decrease of 84.1% 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 n-Butyl alcohol at 38.9K, followed by Xylene (mixed isomers) at 30.0K.
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 other facility.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- US Navy Portsmouth Naval Shipyard's total reported releases rose from 10.5 thousand lb in 2022 to 34.5 thousand lb in 2023, based on EPA TRI filings.
- US Navy Portsmouth Naval Shipyard's air releases rose from 6.7 thousand lb in 2022 to 28.9 thousand lb in 2023, based on EPA TRI filings.
- US Navy Portsmouth Naval Shipyard's chemicals reported rose from 2 in 2022 to 4 in 2023, based on EPA TRI filings.
- US Navy Portsmouth Naval Shipyard's off-site transfers rose from 3.8 thousand lb in 2022 to 5.5 thousand lb in 2023, based on EPA TRI filings.
Total Releases by Category
Year-over-Year Comparison
| Year | Total | Chemicals | YoY Change |
|---|---|---|---|
| 2019 | 5.0K lbs | 2 | - |
| 2020 | 39.7K lbs | 3 | +689.9% |
| 2021 | 5.3K lbs | 1 | -86.6% |
| 2022 | 10.5K lbs | 2 | +96.4% |
| 2023 | 34.5K lbs | 4 | +229.1% |
| 2024 | 799 lbs | 2 | -97.7% |
Top Chemicals by Year
| Chemical | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Total |
|---|---|---|---|---|---|---|---|
| n-Butyl alcohol | - | 19.4K | - | - | 19.5K | - | 38.9K |
| Xylene (mixed isomers) | - | 9.7K | - | 6.7K | 13.6K | - | 30.0K |
| Lead | - | 10.6K | 5.3K | 3.8K | 205 | 13 | 20.0K |
| Lead compounds | 5.0K | - | - | - | - | - | 5.0K |
| Nickel | - | - | - | - | 1.2K | 786 | 2.0K |
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 US Navy Portsmouth Naval Shipyard getting cleaner or dirtier? ▼
What time period does this trend data cover? ▼
Read our methodology - how this data is sourced, computed, and verified.