The most common causes of low residential water pressure include mineral scale accumulation clogging faucet aerators and showerheads, partially closed main water shutoff valves, failing pressure-reducing valves (PRV), clogged whole-house sediment filters, or corroded galvanized supply pipes behind the walls. Additionally, municipal utility main breaks or well pump pressure switch malfunctions frequently cause sudden pressure drops. Verification: Compare water pressure across multiple indoor and outdoor fixtures to determine if the restriction is localized or whole-house.
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