Sudden low water pressure throughout an entire home is typically caused by a few common municipal or residential plumbing issues. First, check if your main water shut-off valve (usually located near the water meter or main entry point) is fully open, as a partially closed valve severely restricts flow. Second, check with your local water utility provider to see if there is a main water line break, temporary municipal repairs, or scheduled maintenance in your neighborhood. Third, if you have a private well system, a sudden drop in pressure often points to a failing pressure switch, a clogged well sediment filter, or a failing pump. Verification: Check multiple faucets across the house and ask neighbors if they are experiencing similar drops.
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