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Vigía is the system for detection, surveillance and visualization of SARS-CoV-2 (the virus that causes the COVID-19 disease) in wastewater. It is the largest analysis system in Spain and consists of: 289 sampling points; 15,000 km of sewerage network and the monitoring of almost the entire population of the Region; the quantification of the presence of SARS-CoV-2 by basins; the normalisation of results; trend analysis; data screening for quality criteria; spatial distribution by municipalities and districts and distributed analysis of results.