When low water pressure is isolated to only one single tap or faucet while all other fixtures in the house maintain normal pressure, the restriction is localized entirely to that specific fixture. Common causes include a mineral-scaled or debris-clogged faucet aerator screen, a partially closed individual supply shut-off valve under the sink, or a worn-out, defective faucet cartridge. Because the rest of your home's plumbing network operates normally, municipal supply lines, main shut-off valves, and pressure reducing valves are not at fault. Verification: Unscrew the faucet aerator tip and check for trapped sand, scale, or sediment buildup.
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