5/15/04 NEW Data now available Invertebrate Data are now available - click Bio Community link on left navigation bar. Invert data are available through September 30, 2002.

NOTE: 4/29/04 The query software has been upgraded. Users that are familiar with the old system will notice some significant differences. Review documentation on this site for query help. The main difference to recognize is this: when runnning a query, to select parameter values, click the flashlight icon next to the field of interest to choose specific parameter values. Use the contact link at the bottom of this page if you have troubles.

See What's New

	Map of NAWQA Study Units Click on map to go to index of study unit home pages.
Software Requires Browser to accept cookies. See note at bottom.

Data subject to change -- current version loaded 08/09/04. Data available through 9/30/03.

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 up through 9/30/2003:

• Chemical concentrations in water, bed sediment, and aquatic organism tissues for about 609 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
• 6,400 surface water sites and 7,000 wells
• 44,000 nutrient samples and 26,000 pesticide samples as well as 8,000 VOC samples
• 2,650 samples of bed sediment and aquatic organism tissues

Much of this data came from the USGS National Water Information System--NWIS Water-Quality Data for NAWQA sites.