Yahara Portal

Explore the legacy and future of the Yahara Lakes and Watershed



Outbreaks of bacteria routinely cause the closing of City of Madison beaches during the summer, resulting in the loss of recreational opportunities as well as economic and social value to residents. The EPA has a health standard for E. coli, the bacterium it uses to measure beach health. If the geometric mean is greater than 235 colony forming units/100 milliliters, the beach is closed.

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