City of Sharonville recently issued the following announcement.
CODE RED: There was a leak of industrial surfactant (detergent) into the sanitary sewer line causing a foam to rise through the system. You may see this on the streets. If you have any foam in the sanitary fixtures in your home, contact the Sharonville Fire Department 513-505-1819 for assistance.
The EPA and Hamilton County Hazmat are continuing to investigate, but at this point, no known illnesses or injuries have been reported. There is no reason to believe the substance is highly toxic or dangerous as of now.
Original source can be found here.