A basement floor drain backing up with raw sewage is a clear sign of a severe, catastrophic blockage or structural collapse in your main underground sewer line connecting your home to the municipal main or septic tank. Because basement floor drains sit at the lowest elevation in the household plumbing network, any downstream obstruction forces municipal wastewater and sewage to rise and exit out of the lowest available opening. Verification: Stop using all indoor water fixtures immediately and call a licensed plumber for professional main line snaking and video inspection.
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