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riverNorthern snakeheadreported
Documented northern snakehead water in Allegheny County, Pennsylvania. Lower Allegheny drainage. 1 USGS specimen record (2022); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 3 USGS specimen records (2017–2018); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadestablished
Documented northern snakehead water in Chester County, Pennsylvania. Chester-Sassafras drainage. 2 USGS specimen records (2021–2023); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 2 USGS specimen records (2022); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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pondNorthern snakeheadreported
Documented northern snakehead water in Dauphin County, Pennsylvania. Lower Susquehanna-Swatara drainage. 1 USGS specimen record (2026); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadestablished
Documented northern snakehead water in Delaware County, Pennsylvania. Lower Delaware drainage. 3 USGS specimen records (2020–2024); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadreported
Documented northern snakehead water in Lancaster County, Pennsylvania. Lower Susquehanna drainage. 1 USGS specimen record (2025); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Delaware County, Pennsylvania. Lower Delaware drainage. 1 USGS specimen record (2013); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadestablished
Documented northern snakehead water in Delaware County, Pennsylvania. Lower Delaware drainage. 5 USGS specimen records (2011–2023); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadestablished
Documented northern snakehead water in Bucks County, Pennsylvania. Middle Delaware-Musconetcong drainage. 38 USGS specimen records (2005–2025); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadestablished
Documented northern snakehead water in Delaware County, Pennsylvania. Lower Delaware drainage. 1 USGS specimen record (2013); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in York County, Pennsylvania. Lower Susquehanna drainage. 3 USGS specimen records (2020); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2024); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadestablished
Documented northern snakehead water in Philadelphia County, Pennsylvania. Schuylkill drainage. 9 USGS specimen records (2004–2006); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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pondNorthern snakeheadreported
Documented northern snakehead water in Lancaster County, Pennsylvania. Lower Susquehanna drainage. 1 USGS specimen record (2020); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadestablished
South Philadelphia's urban snakehead hotspot — lagoons right off I-95.
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creekNorthern snakeheadreported
Documented northern snakehead water in Northampton County, Pennsylvania. Middle Delaware-Musconetcong drainage. 1 USGS specimen record (2024); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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pondNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Middle Delaware-Musconetcong drainage. 1 USGS specimen record (2016); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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pondNorthern snakeheadreported
Documented northern snakehead water in Cumberland County, Pennsylvania. Lower Susquehanna-Swatara drainage. 1 USGS specimen record (2023); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 1 USGS specimen record (2025); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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canalNorthern snakeheadreported
Documented northern snakehead water in Dauphin County, Pennsylvania. Lower Susquehanna-Swatara drainage. 1 USGS specimen record (2026); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2025); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2025); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadreported
Documented northern snakehead water in Wayne County, Pennsylvania. Lackawaxen drainage. 1 USGS specimen record (2025); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in York County, Pennsylvania. Lower Susquehanna drainage. 2 USGS specimen records (2020–2021); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadreported
Tidal lower Schuylkill through Philadelphia holds snakehead.
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riverNorthern snakeheadreported
Below Conowingo Dam and up into the lower Susquehanna, snakehead numbers are climbing.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 1 USGS specimen record (2024); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 4 USGS specimen records (2020–2026); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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canalNorthern snakeheadestablished
Documented northern snakehead water in Philadelphia County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2018); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 4 USGS specimen records (2013–2024); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadestablished
Documented northern snakehead water in Philadelphia County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2006); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadreported
Documented northern snakehead water in Allegheny County, Pennsylvania. Lower Monongahela drainage. 1 USGS specimen record (2019); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadestablished
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 4 USGS specimen records (2015–2023); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Chester County, Pennsylvania. Lower Susquehanna drainage. 6 USGS specimen records (2018–2023); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadestablished
Documented northern snakehead water in Lancaster County, Pennsylvania. Lower Susquehanna drainage. 2 USGS specimen records (2022); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2020); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Montgomery County, Pennsylvania. Schuylkill drainage. 2 USGS specimen records (2024); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Lancaster County, Pennsylvania. Lower Susquehanna drainage. 1 USGS specimen record (2024); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Montgomery County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2025); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadestablished
Documented northern snakehead water in Berks County, Pennsylvania. Schuylkill drainage. 5 USGS specimen records (2019–2025); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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canalNorthern snakeheadestablished
Documented northern snakehead water in Philadelphia County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2023); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadestablished
Documented northern snakehead water in Philadelphia County, Pennsylvania. Schuylkill drainage. 1 USGS specimen record (2008); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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pondNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 1 USGS specimen record (2022); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadestablished
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 1 USGS specimen record (2022); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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lakeNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Crosswicks-Neshaminy drainage. 1 USGS specimen record (2022); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadreported
Documented northern snakehead water in York County, Pennsylvania. Lower Susquehanna drainage. 6 USGS specimen records (2020–2024); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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riverNorthern snakeheadreported
Documented northern snakehead water in Lancaster County, Pennsylvania. Lower Susquehanna drainage. 1 USGS specimen record (2023); status: reported. Location verified from the USGS Nonindigenous Aquatic Species database.
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pondNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Middle Delaware-Musconetcong drainage. 1 USGS specimen record (2020); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadestablished
Documented northern snakehead water in Bucks County, Pennsylvania. Middle Delaware-Musconetcong drainage. 1 USGS specimen record (2021); status: established. Location verified from the USGS Nonindigenous Aquatic Species database.
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creekNorthern snakeheadreported
Documented northern snakehead water in Bucks County, Pennsylvania. Middle Delaware-Musconetcong drainage. 1 USGS specimen record (2013); status: unknown. Location verified from the USGS Nonindigenous Aquatic Species database.
