Low residential water pressure can stem from several potential causes, including partially closed main water shutoff valves, failing or improperly adjusted pressure-reducing valves (PRV), clogged whole-house sediment filters, heavy mineral scale inside aging galvanized supply pipes, or municipal utility supply restrictions. On well systems, a failing pressure switch or waterlogged pressure tank will also cause low pressure. Verification: Check pressure readings at an outdoor hose bibb to diagnose whether the issue affects the entire home.
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