Bayesian credible interval plot of virus concentration estimates from PCR-positive DWTP water samples. AdV =adenovirus, EV=enterovirus, NoV I=Norovirus GI, NoV II=Norovirus GII, PyV =polyomavirus. Numbers represent DWTP identification. S and T suffixes represent source and treated water samples, respectively. Bars represent 95% credible intervals. The values above each bar is the concentration of virus genome molecules per liter.