CLEVELAND, Ohio — Cleveland health officials are warning residents about a sharp increase in COVID-19 levels detected in the city’s wastewater, signaling a likely uptick in community spread in the coming weeks.

According to the Cleveland Department of Public Health, recent samples collected from the Northeast Ohio Regional Sewer District’s Easterly Wastewater Treatment Plant showed levels of the virus that causes COVID-19 spiking more than 250% compared to the previous month’s average. The jump triggered notification thresholds set by the Ohio Department of Health.

“Increasing viral concentrations in wastewater are often a leading indicator of future spikes in illness, hospitalizations, and transmission throughout the community,” said Director of Public Health David Margolius. “This data provides us with an early warning system, and we’re encouraging residents and institutions to take preventive steps now.”

Wastewater surveillance has become a key tool for tracking community infection trends, including among people who may not seek testing or show symptoms. In addition to the COVID-19 virus surge, the same samples also revealed high levels of influenza and increasing levels of respiratory syncytial virus (RSV), though RSV remains in its baseline monitoring phase.

Health officials are urging residents to stay up to date on vaccinations for both COVID-19 and the flu. Those experiencing respiratory symptoms are advised to stay home or wear a mask if they need to go out.

The Cleveland Department of Public Health said it will continue to monitor the situation and provide updates as necessary.