Features

• Nutrients in streams and rivers across the Nation--1992-2001
• Vulnerability of shallow groundwater and drinking-water wells to nitrate in the United States
• Factors influencing ground-water recharge in the eastern United States
• New USGS studies on effects on nutrient enrichment on stream ecosystems
• Nutrients in ground waters of the conterminous United States, 1992-1995
• Understanding nutrients in surface water using the national SPARROW model
• Transport and fate of nitrate and pesticides: Hydrogeology and riparian zone processes
• Drinking-water nitrate and health--Recent findings and research needs

National Data Sets

• Water-quality, streamflow, and ancillary data for nutrients in streams and rivers across the Nation, 1992-2001
• County-level estimates of nutrient inputs to the land surface 1982-2001
• Summary of nutrient concentrations for streams and ground water - July 2000 (Used by Heinz Center)
• Nutrient concentrations and yields in undeveloped stream basins - 2000
• Surface water (rivers and streams) - 1999
• Ground water (aquifers) - 1999
• Retrospective database for nutrients in ground water and surface water - 1996
• Other data (Ancillary, GIS)