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Why does wastewater back up into the lowest shower first?
Short Answer: Gravity makes the lowest fixture the easiest overflow point.
Detailed Answer: During septic or sewer backups, wastewater seeks the lowest available opening in the plumbing system. Basement showers, floor drains, and lower-level tubs often show symptoms first.
Related Questions: What fixture backs up first during septic failure? Why is my basement drain backing up? Is shower backup a septic warning sign?