Since the early stages of the COVID-19 pandemic, sewage systems in cities around the United States have helped track the spread of the coronavirus in real-time. CDC said those following projects would have public visibility through a tool on the Centers for Disease Control and Prevention’s COVID-19 data tracking website.
The tool pulls in data from National Wastewater Surveillance System (NWSS), which the CDC launched in September 2020. That network includes data from more than 400 sites in the US. Wastewater gives officials a way to track the spread of the coronavirus because the virus can be detected in the feces of residents before they are prompted to get tested.
Early on in the pandemic, this method was used in places like New York City and universities like the University of Arizona, which used wastewater tracking to visualize and predict the spread of COVID-19. The results can be an early signal that a wave of infections is coming.The map shows how much coronavirus’s genetic material levels in wastewater have changed at each site over the previous 15 days. If a site does not detect the coronavirus after performing at least one test during those 15 days, it will be logged as “non-detects.” If no samples were collected during the 15 days, it would be labeled as “no recent data.”