We just discovered sewage waste backing up into our storm sump. We are on city sewer and lived in the house for 8 years and never have experienced this problem before. Currently there is 12 or more inches of snow on the ground, making any access from the street to our house difficult. Does this sound like a problem from our house to the city sewer system, or a problem with our city sewer main ? We just called a sewer expert and are waiting for help.

Where does the storm sump discharge to. Is it by any chance emptying into your sewer drain?