The use of wastewater surveillance has emerged as a powerful tool in the fight against COVID-19, providing critical data on community transmission levels. In Ontario, this technique has been successfully implemented to detect early signs of COVID-19 outbreaks in various regions. By analyzing samples of wastewater, scientists can detect traces of the virus that are shed by infected individuals. This helps to identify areas with high levels of viral RNA and predict where COVID-19 cases may be on the rise. The recent wastewater data from Ontario highlights the importance of ongoing monitoring to prevent further spread of the virus.