Key warning signs of a serious, main-line plumbing clog include water backing up into multiple unrelated fixtures simultaneously (such as water rising in the shower when you flush the toilet or run the sink), persistent gurgling sounds coming from drain traps when wastewater empties, foul sewage odors wafting from floor drains, and exceptionally slow or completely halted drainage across the entire house. Verification: Inspect multiple plumbing fixtures to determine whether the blockage affects the main sewer line.
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