Basement sewer backups are frequently caused by tree root intrusion into underground lateral pipes, structural pipe collapse, accumulation of grease and solid foreign objects, or municipal sewer main surcharges during heavy rainstorms. Because basement floor drains sit at the lowest elevation in the home's plumbing network, any downstream restriction in the main sewer line forces municipal wastewater and raw sewage to rise and exit out of the lowest available drain openings. Verification: Schedule a professional video camera scope inspection of your underground sewer line to identify potential root infiltration or pipe damage.
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