Line chart showing the 7-day rolling average COVID-19 viral load in Twin Cities metro wastewater from Nov. 6, 2020, to Nov. 21, 2022. The average copies per day per person began slightly above 200 million and grew to 400 million by the end of November 2020. The viral load then dropped and stayed below 200 million until January 2022, where it peaked at nearly 1 billion before dropping. As of November 21, 2022, the viral load was 156.3 million copies per person per day.