I think you're misinterpreting what the link is saying. They are using the presence of COVID pieces to determine the spread of infection in the community. These pieces are not "live" viruses that can infect you. Basically, if they discover much more of these pieces than would be expected by the number of confirmed cases, it would indicate that more people are infected than currently thought. The wastewater here does not pose a risk of acquiring the virus by it presence wherever it is used.
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