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Subject is Water quality biological assessment
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View Resource National Water Quality Assessment Data Warehouse (NAWQA)

Chemical, biological, and physical water quality data from a study of 42 watershed basins.

http://infotrek.er.usgs.gov/apex/f?p=NAWQA:HOME:0
View Resource Complete Listing of NAWQA’s Study Units and Summary Reports

Reports on the top 52 US water drainages between 1990 and 2001. E-circulars include surface water, ground water, urban effects, and topics such as fish and algae.

http://water.usgs.gov/nawqa/studies/study_units_listing.html
View Resource Water Quality in the Eastern Iowa Basins, Iowa and Minnesota, 1996-98

A report on water quality assessment available in html and pdf format.

http://pubs.usgs.gov/circ/circ1210/
View Resource Assessing the Spatial and Temporal Distribution of MTBE and BTEX Compounds in Lake Lewisville, Texas February 1999 - February 2000

The spatial and temporal distribution of Methyl Tertiary-Butyl Ether (MTBE) and BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds were assessed in a multipurpose reservoir, Lake Lewisville,...

http://digital.library.unt.edu/ark:/67531/metadc2630/
View Resource Water Quality: Biocriteria

The presence, condition and numbers of types of fish, insects, algae, plants, and other organisms are data that together provide direct, accurate information about the health of specific bodies of...

http://water.epa.gov/scitech/swguidance/waterquality/standar...
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