*Note that catchment area refers to the intake area for each wastewater treatment plant. Laboratory-confirmed case numbers for the most recent 2-3 weeks are typically not yet complete due to reporting delays. Per-catchment case numbers are estimated based on postal code and a delineation for each catchment area, potentially resulting in non-integer case numbers. For more informaton on the specific catchments studied, see the EAWAG project page for SARS-CoV-2 monitoring in wastewater.