The most recent data from the CDC shows that last month nearly half of the United States have reported 'very high' levels of COVID-19 activity. As concerns with COVID have waned across the U.S., the CDC has come to rely on wastewater data to track the virus, which often lags several weeks behind current case counts. Data collected between Aug. 25 and Aug. 31 by the CDC showed that 23 states have reported 'very high' levels of wastewater viral activity nationwide. The data was published on Sept. 5.