Yes, a continuously running toilet can cause noticeable low water pressure at nearby household fixtures, especially if your plumbing supply lines are older, undersized, or mineral-scaled. A running toilet constantly draws a heavy stream of water into the tank, consuming a significant portion of the flow capacity traveling through your home's branch lines. When another fixture like a shower or kitchen sink is opened simultaneously, the remaining water volume is inadequate to maintain normal pressure. Verification: Fix the running toilet flapper or fill valve to restore normal pressure across all household fixtures.
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