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1. BioData - Aquatic Bioassessment Data for the Nation [USGS_BioData]
The U.S. Geological Survey (USGS) BioData Retrieval system provides access to aquatic bioassessment data (biological community and physical habitat data) collected by USGS scientists from stream ecosystems ...


2. GIS Coverage for the National Water-Quality Assessment (NAWQA) Program Retrospective Database for Nutrients in Surface Water: Monitoring Locations [NAWQAHIS]
The retrospective database is a compilation of historical water-quality and ancillary data collected before NAWQA Study Units initiated sampling in 1993. This coverage contains the point locations ...


3. GIS Coverage of the National Water-Quality Assessment (NAWQA) Program Trace Elements Sampling Sites for the EPA Clean Air Mapping and Analysis Program (C-MAP) [NAWQA_TE]
This is a point coverage of the sampling sites for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Trace Elements for the conterminous United ...


4. GIS Coverage of the National Water-Quality Assessment Study-Unit Investigations in the conterminous United States (NAWQA) [NAWQA]
This is a coverage of the boundaries and codes used for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations for the conterminous United States, excluding ...


5. Risk of nitrate contamination in ground waters of the United States-- A national perspective [USGS_gwrisk]
This map was designed to present patterns of risk for nitrate contamination at large regional or national scales. Knowing where and what type of risks to ground water exist can alert water-resources ...


6. GIS Coverage of the National Water Quality Assessment Program: Surface Water Nutrient Sampling Sites for the EPA Clean Air Mapping and Analysis Program (C-MAP) [NAWQA_NU]
This is a point coverage of the sampling sites for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Surface Water Nutrients for the conterminous ...


7. Arsenic in ground water of the United States [USGS_ARSENIC_H2O]
[From Arsenic in ground water of the United States, "http://water.usgs.gov/nawqa/trace/arsenic/" Arsenic is a naturally occurring element in the environment. Arsenic in ground water is largely the ...


8. Digital Data Sets Describing Water Use, Toxic Chemical Releases, Metropolitan Areas, and Population Density of the Conterminous United States [USGS_OFR_99-78]
This report contains digital data sets describing water use, toxic chemical releases, metropolitan areas, and population density of the conterminous United States. The data source for the water-use ...


9. Digital Data Sets Describing Principal Aquifers, Surficial Geology, and Ground-Water Regions of the Conterminous United States [USGS_OFR_99-77]
This report contains digital data sets describing principal aquifers, surficial geology, and ground-water regions of the conterminous United States. The data source for the principal aquifers and ...


10. Lithogeochemical Character of Near-Surface Bedrock in the New England Coastal Basins [USGS_ofr02-007_lithogeo]
The lithogeochemical data layer was compiled to provide the NECB NAWQA study area with digital geologic information that could be used in the analysis of surface- and ground-water quality. Goals of ...


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