Although it is not uncommon to detect pathogens in wastewater, the risk of harm to human health or the environment is not proven.
First of all, to contaminate a host, a virus must be in the right environment.
Whereas very fine aerosols are problematic, dissolved in a container or a stream, a virus has a lower capacity to contaminate.
Above all, the very organization of water systems makes contact between viruses and hosts much more difficult.
Wastewater and drinking water networks are very clearly separated in their construction and in their uses (this is one of the reasons why toilets are supplied with perfectly clean and drinkable tap water).