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Data subject to change - source data extracted between 4/29/2009 and 4/30/2009.
About the NAWQA Data Warehouse
The U.S. Geological Survey (USGS) began its NAWQA (National Water Quality Assessment) program in 1991, systematically collecting chemical, biological, and physical water quality data from 42
study units (basins) across the nation. The data warehouse currently contains and links the following data:
- Chemical concentrations in water, bed sediment, and aquatic organism tissues for about 3,100 chemical constituents
- Site, basin, well and network characteristics with many descriptive variables
- Daily stream flow information for fixed sampling sites
- Ground water levels for sampled wells
- 7,600 surface water sites (including 2,700 reach segments for biological studies) and 8,800 wells
- 51,000 nutrient samples and 32,000 pesticide samples as well as 10,000 VOC samples
- 2,600 samples of bed sediment and aquatic organism tissues
- Biological community data for 22,500 fish, algae and invertebrate samples
Most of these data came from the USGS National Water Information System--NWIS Water-Quality Data for NAWQA sites.