Actually, there was a recent study (Lancet Hapatology for original article—https://dgalerts.docguide.com/stability-sars-cov-2-different-environmental-conditions-sars-cov-2-wastewater-and-guidance?nl_ref=newsletter&pk_campaign=newsletter&nl_eventid=35812&nl_campaignid=3720&pw_siteID=25&ncov_site=covid-19) that not only showed coronavirus in water, but that the amount in the water was a predictor for blooming hot spot of virus. That is, testing the water downstream of a community for viral load, could predict rise in infections in that community. Further, and not well known, is that covid causes a significant number of people to have what appear to be gastrointestinal infections, without the expected respiratory symptoms. MJGroves, MD