whereas the ATS and STS both had retention times of 2.3 d based on dye tracer studies. Subsequently, 5 L of
effluent from each treatment plant was collected on its corresponding sample day on six sampling dates over a three week period during summer conditions. Effluents were collected from the on-site systems prior to soil infiltration, which was intended to model worst case loadings to the environment with limited to no soil treatment. Because population demographics may influence