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Ecological National Synthesis (ENS) Project

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various images
Invertebrate photos by:
Jim Carter and Steve Fend, USGS, Menlo Park, CA

The Ecological National Synthesis (ENS) Project of the National Water-Quality Assessment (NAWQA) Program provides a national-scale perspective and assessments on aquatic ecology, and the chemical and physical factors that affect aquatic conditions and health. Implemented in 1991, data have been collected by NAWQA on chemistry, hydrology, land use, stream habitat, and aquatic life in parts or all of nearly 50 States using a nationally consistent study design and uniform methods of sampling (access method, sampling, and analytical protocols).

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