Sewage backs up into the basement floor drain
Sewage coming up through the basement floor drain means the blockage sits in the main line, downstream of every fixture in the house. The floor drain is the lowest opening, so it fills first. Stop running water and get the line cabled and then camera'd, because the camera is what tells you whether this is a one-time clog or a defect in the pipe. A line that backs up again within weeks of a clearing has a flat spot, roots or a broken section, and no amount of cabling fixes that.
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