Residential underground sewer lines typically back up due to intrusive tree roots seeking moisture through micro-cracks, accumulation of non-flushable items like wipes and grease, structural pipe sagging (belly), or collapsed clay tiles. Over time, these obstructions trap household waste, narrowing the interior pipe diameter until wastewater can no longer escape, eventually forcing sewage to surcharge upward into basement floor drains and lowest-level plumbing fixtures. Verification: Schedule a professional video camera sewer scope inspection every few years to monitor pipe condition.
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