Lake Geneva to swim at some beaches of the lake; indeed, visibility under water was near zero. By the 1980s, intense environmental pollution (eutrophication) had almost wiped out all the fish. Today, pollution levels have been dramatically cut back, and it is again considered safe to swim in the lake. Major leisure activities practiced include sailing, wind surfing, boating (including water skiing and wakeboarding), rowing, scuba diving and bathing. On a scientific footnote, in 1827, Lake Geneva was the site for the first measurement of the speed of sound in (fresh) water. French mathematician Jacques Charles François Sturm and Swiss Physicist Daniel
Fontana-on-Geneva Lake, Wisconsin and the median income for a family was $63,594. Males had a median income of $41,750 versus $31,813 for females. The per capita income for the village was $32,266. About 2.4% of families and 3.8% of the population were below the poverty line, including 3.8% of those under age 18 and 3.0% of those age 65 or over. Fontana-on-Geneva Lake, Wisconsin Fontana-on-Geneva Lake (Locally referred to as "Fontana") is a village in Walworth County, Wisconsin, United States. The population was 1,672 at the 2010 census. Fontana-on-Geneva Lake is located at (42.544288, -88.566010). According to the United States Census Bureau, the