National Water-Quality Assessment (NAWQA) Project

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Special studies on source-water and drinking-water quality
Surface-water intakes
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About National-Synthesis Assessments

National teams synthesize the results of all the NAWQA investigations with information from other programs, agencies, and researchers. These national syntheses are possible because each NAWQA investigation adheres to a nationally consistent study design and uniform methods of data collection and analysis. National syntheses provide an understanding of how and why water quality varies regionally and nationally.

National Synthesis results help to answer the following types of questions:

National Synthesis addresses priority water-quality issues:

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