Table S1 provides the maximum allowable influent silver concentrations (C0, in ppb) for a wastewater treatment plant (WWTP) to achieve an effluent silver concentration below 1.9 ppb. The data are presented as a function of operational parameters, specifically MLSS ( mixed liquor suspended solids) and θ:τ (the ratio of contact time to detention time).Table S1 provides the maximum allowable influent silver concentrations (C0, in ppb) for a wastewater treatment plant (WWTP) to achieve an effluent silver concentration below 1.9 ppb. The data are presented as a function of operational parameters, specifically MLSS ( mixed liquor suspended solids) and θ:τ (the ratio of contact time to detention time).