Chemical analyses of wastewater may reveal public and environmental health effects of the pandemic

When investigators analyzed primary sludge collected during the first wave of COVID-19 (March 19 to June 30, 2020) at a wastewater treatment plant in Connecticut, they found trends in the presence of chemicals that related directly to the pandemic—for example, hydroxychloroquine had elevated concentrations in the week following Emergency Use Authorization of the drug for the treatment of COVID-19.  

source https://medicalxpress.com/news/2021-10-chemical-analyses-wastewater-reveal-environmental.html