Viruses from human sources occur in the La Crosse, Wisconsin municipal drinking water supply prior to its chlorination, according to a study published today in the scientific journal Applied and Environmental Microbiology. Although the city’s treated water meets or exceeds state and federal standards for drinking water, researchers and public health officials agree that more study is needed to pinpoint sources of the viruses and to determine if some viruses are surviving chlorination and making people sick with diarrhea and vomiting.
