Chicago operates a combined sewer system that handles both sanitary waste and stormwater runoff in the same pipes. When rainfall exceeds system capacity, water backs up through floor drains into basements. This affects older neighborhoods across the city during heavy rain events. The water entering your basement through floor drains is Category 3 contaminated water requiring aggressive disinfection protocols. Many homeowners do not realize their standard sump pump offers zero protection against this type of flooding. A properly installed overhead sewer with backwater valve is the only reliable prevention method.
Cornerstone Water Damage Restoration Chicago has managed hundreds of combined sewer backup incidents. We understand the specific health risks associated with this contamination category. Our crews follow Chicago Department of Public Health guidelines for sewage cleanup. We coordinate with licensed plumbers who install compliant backwater valve systems. Our relationship with local building inspectors ensures your restoration work passes inspection on the first attempt. This local expertise matters when you face contaminated water in your basement at 2 AM during a thunderstorm.