National Water-Quality Assessment (NAWQA) Program

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The National Water-Quality Assessment (NAWQA) Program has produced more than 1,500 reports (complete bibliography) describing how water quality conditions vary locally, regionally, and nationally; whether conditions are getting better or worse over time; and how natural features and human activities affect these conditions. Conditions also were compared to national water-quality standards, guidelines, and benchmarks to assess the potential effects on drinking water and aquatic life. Most of these reports can be accessed on-line through the topical and geographical searches listed below.


Quick Links
to selected NAWQA reports:

General Interest Reports - summaries of relevant scientific information in a form designed for general and scientific audiences.

Fact Sheets - 2-6 page summaries of selected topics or report highlights

National NAWQA Publications

NAWQA publications by state:

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Recently Added:

Stets, E.G., Kelly, V.J., and Crawford, C.G., 2015, Regional and Temporal Differences in Nitrate Trends Discerned from Long-Term Water Quality Monitoring Data: JAWRA Journal of the American Water Resources Association, 51(5), p. 1394-1407.  doi:10.1111/1752-1688.12321 Available Online

Kelly, V., Stets, E.G., Crawford, C., 2015, Long-term changes in nitrate conditions over the 20th century in two Midwestern Corn Belt streams: Journal of Hydrology, 525(0), p. 559-571.  doi:10.1016/j.jhydrol.2015.03.062 Available Online

Tesoriero, A.J., Terziotti, S., and Abrams, D.E., 2015, Predicting redox conditions in groundwater at a regional scale: Environmental Science and Technology, v. 49, p. 9657-9664.  doi: 10.1021/acs.est.5b01869 Available Online

Faunt, Claudia C., and Sneed, M., 2015, Water Availability and Subsidence in California's Central Valley: San Francisco Estuary and Watershed Science, 13(3),   Available Online

Eng, K., Wolock, D.M., and Dettinger, M.D., 2015, Sensitivity of intermittent streams to climate variations in the USA: River Research and Applications,   DOI: 10.1002/rra.2939 Available Online

McCabe, G.J. and Wolock, D.M., 2015, Increasing Northern Hemisphere water deficit: Climatic Change, vol. 132 (2), p. 237-249.  DOI: 10.1007/s10584-015-1419-x Available Online

Shipitalo, M.J., Malone, R.W., Ma, L., Nolan, B.T., Kanwar, R.S., Shaner, D.L., and Pederson, C.H., 2015, Corn stover harvest increases herbicide movement to subsurface drains - Root Zone Water Quality Model simulations: Pest. Manag. Sci,   DOI 10.1002/ps.4087 Available Online

Fienen, M.N., Nolan, B.T., Feinstein, D.T., and Starn J.J., 2015, Metamodels to bridge the gap between modeling and decision support: Groundwater, v. 53, no. 4, p. 511-512.  DOI: 10.1111/gwat.12339 Available Online

Starn, J.J., Bagtzoglou, A.C., Green, C.T., 2015, The effects of numerical-model complexity and observation type on estimated porosity values: Hydrogeology Journal, vol. 23 (6), p. 1121-1128.  DOI 10.1007/s10040-015-1289-3 Available Online

Ryberg, K.R., Gilliom, R.J., 2015, Trends in pesticide concentrations and use for major rivers of the United States: Science of the Total Environment, v. 538, p. 431-444.  doi:10.1016/j.scitotenv.2015.06.095 Available Online

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