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National and Regional Assessments

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Screenshot of web map and map controls; shaded areas show total phosphorus levels in Northeast US streams

2012 SPARROW Models for the Northeast: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow

The 2012 SPAtially Referenced Regression On Watershed attributes (SPARROW) Models measure the damaging contaminants of phosphorus, nitrogen, and suspended sediment in streamflow throughout the Northeast United States. Through various types of watershed management practices, loads of nutrients and suspended sediment are significantly reduced within the stream network in impounded reaches, and...
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Maryland-Delaware-D.C. Water Science Center
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2012 SPARROW Models for the Northeast: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow

The 2012 SPAtially Referenced Regression On Watershed attributes (SPARROW) Models measure the damaging contaminants of phosphorus, nitrogen, and suspended sediment in streamflow throughout the Northeast United States. Through various types of watershed management practices, loads of nutrients and suspended sediment are significantly reduced within the stream network in impounded reaches, and...
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Scientist in laboratory working in anaerobic chamber

Region 1: North Atlantic-Appalachian PFAS Capability Team

Per- and polyfluoroalkyl substances (PFAS) are a group of anthropogenic emerging contaminants. Some PFAS have been voluntarily phased out, as exposure has been linked to adverse human health effects.
By
Toxic Substances Hydrology, Water Availability and Use Science Program, Maryland-Delaware-D.C. Water Science Center, New England Water Science Center, New Jersey Water Science Center, Pennsylvania Water Science Center
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Region 1: North Atlantic-Appalachian PFAS Capability Team

Per- and polyfluoroalkyl substances (PFAS) are a group of anthropogenic emerging contaminants. Some PFAS have been voluntarily phased out, as exposure has been linked to adverse human health effects.
Learn More