Low water pressure restricted specifically to your home's first floor while upper floors or outdoor spigots maintain normal pressure is typically caused by a partially closed branch line shut-off valve, localized pipe corrosion restricting flow to that level, or a clogged whole-house water filter. Because water travels upward through vertical risers, a pressure drop isolated to a specific lower level indicates an obstruction or restriction in the horizontal branch lines feeding that zone of the house. Verification: Inspect branch shut-off valves and check inline filters or pressure regulators serving the affected floor.
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