You can identify a main sewer line backup by watching for widespread plumbing symptoms across your home. Key indicators include multiple unrelated fixtures backing up simultaneously (such as water gushing into your bathtub or basement floor drain when you flush the toilet or run the washing machine), persistent gurgling sounds echoing through P-traps, foul sulfur odors wafting from floor drains, and toilets failing to empty properly. Verification: Inspect your lowest basement floor drains at the first sign of simultaneous fixture sluggishness.
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