Skip to main content
U.S. flag

An official website of the United States government

Publication Date
1 December 2021

Comparison of potential drinking water source contamination across one hundred U.S. cities



Drinking water supplies of cities are exposed to potential contamination arising from land use and other anthropogenic activities in local and distal source watersheds. Because water quality sampling surveys are often piecemeal, regionally inconsistent, and incomplete with respect to unregulated contaminants, the United States lacks a detailed comparison of potential source water contamination across all of its large cities. Here we combine national-scale geospatial datasets with hydrologic simulations to compute two metrics representing potential contamination of water supplies from point and nonpoint sources for over a hundred U.S. cities. We reveal enormous diversity in anthropogenic activities across watersheds with corresponding disparities in the potential contamination of drinking water supplies to cities. Approximately 5% of large cities rely on water that is composed primarily of runoff from non-pristine lands (e.g., agriculture, residential, industrial), while four-fifths of all large cities that withdraw surface water are exposed to treated wastewater in their supplies.

Turner, Sean W. D., Jennie S. Rice, Kristian D. Nelson, Chris R. Vernon, Ryan McManamay, Kerim Dickson, and Landon Marston. 2021. “Comparison Of Potential Drinking Water Source Contamination Across One Hundred U.s. Cities”. Nature Communications 12 (1). Springer Science and Business Media LLC. doi:10.1038/s41467-021-27509-9.
Funding Program Area(s)