The Centers for Disease Control and Prevention will publish data from wastewater surveillance as a tool to measure the amount of COVID-19 circulating.

More than 400 sites across 19 states will begin submitting findings to the CDC this week, and another 250 sites will come online in the coming weeks. The agency said it will begin publishing data collected as part of its National Wastewater Surveillance System on the COVID-19 dashboard for the first time.