Power plants are stressing freshwater resources around the country, according to a new report that finds both the quantity and quality of water supplies—”even in unexpected places—”are affected.

The report, Freshwater Use by U.S. Power Plants: Electricity’s Thirst for a Precious Resource, is based on three years of research by the Union of Concerned Scientists (UCS) and a team of more than a dozen scientists. It is the “first systematic assessment of how power-plant cooling affects freshwater resources across the United States and of the quality of the data available on power plant water usage,” according to UCS.