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Since 1995, the National Stream Quality Accounting Network (NASQAN) of the U.S. Geological Survey (USGS), has focused on monitoring the water quality of four of the Nation's largest rivers the Mississippi (including the Missouri and Ohio), the Columbia, the Colorado, and the Rio Grande. NASQAN operates a network of 39 stations where the concentration of a broad range of chemicals, including pesticides and trace elements, and stream discharge are measured. From these data, source areas of contaminants can be identified; contaminants can be routed through the river system to determine gains and losses; and the amount of contaminants delivered to receiving waters such as estuaries and reservoirs can be estimated. NASQAN data provide information on the influence of large-scale environmental processes and human activities on these rivers that serve as drinking-water supplies, navigational routes, recreational areas, and biological habitats.

NASQAN, a program to monitor the water quality of the nation's large rivers