A sudden drop in home water pressure is typically caused by a municipal water main break, scheduled public utility pipe maintenance, a failing well pump pressure switch, a clogged whole-house sediment filter, or a partially closed main water shutoff valve. When sediment clogs the main filter cartridge or the utility supply drops, water delivery across all household fixtures decreases instantly. Verification: Check whether pressure is low at only one tap or across every fixture in the house.
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