What are the chances of finding SARS-CoV-2 in treated wastewater?

Wurtzer et al (2020) showed the detection of SARS-CoV-2 in Parisian treated wastewater. However, the treated wastewater effluents showed a 100 times reduction in the viral load compared to the corresponding raw wastewater samples, which is in agreement with previous work on enteric viruses (Prevost et al., 2015).