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  Additional Information
CSO Occurrences (Wet Weather)
Map of CSO Locations

 CSO Notification
Above: Combined sewers carry stormwater and sewage. When it rains, debris (like plastic bottles and waste from street curbs) floats into combined sewers. Heavy rains can cause combined sewers to fill very quickly, and to prevent flooding in homes or treatment facilities, they can discharge to the environment, causing floating debris shown here to enter local waterways.

What do the Combined Sewer Overflow (CSO) signs look like?

There are two different types of CSO signs: one is permanent and the other is temporary.

Permanent CSO Sign:


This is an example of the District's permanent CSO sign which is permanently posted by the actual location of combined sewer overflows.

Wherever you see this sign, or one like it, a combined sewer overflow may discharge into the nearest body of water when it rains.

If you see a CSO discharge during dry weather, or someone dumping pollutants into the water, please call (216) 432-7333 and provide the CSO Outfall number. The CSO Outfall number will tell us where that particular CSO is located.

Temporary CSO Sign:


These temporary signs may be posted at beach locations near outfalls for up to 48 hours following a heavy rain event.

What are beach advisories?

The Sewer District tests beach water quality daily during the recreational beach season. Official test results can take 24 hours, but the Ohio Nowcast system uses our data to help predict the likelihood of higher bacteria levels at several local beaches, particularly following heavy storms. Learn more about beach advisories and Nowcast.