Whitewater is a city located in Walworth and Jefferson counties in the U.S. state of Wisconsin. Located near the southern portion of the Kettle M…Whitewater is a city located in Walworth and Jefferson counties in the U.S. state of Wisconsin. Located near the southern portion of the Kettle Moraine State Forest, Whitewater is the home of the University of Wisconsin–Whitewater. As of the 2020 census, the city's population was 14,889.