A severe sewer backup is visually unmistakable and highly hazardous, typically presenting as raw, turbid wastewater, dark sludge, and floating solid waste erupting upward out of lowest-level household plumbing fixtures, such as basement floor drains, shower basins, and ground-floor toilets. As municipal wastewater surcharges under pressure, it floods flooring, saturates drywall, and leaves behind foul-smelling organic residue and debris across living spaces. Verification: Stop using all indoor water fixtures immediately and inspect basement drainage points for rising wastewater.
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