Low water pressure isolated to a single faucet is typically caused by a clogged aerator screen packed with mineral scale or sediment, a partially closed individual supply shut-off valve under the sink, or a failing faucet cartridge. Over time, hard water calcium deposits build up inside the tiny mesh screen of the faucet aerator, restricting water flow. Similarly, a supply valve that was accidentally bumped closed or a damaged internal valve cartridge can choke off water delivery to that specific fixture. Verification: Unscrew the faucet tip aerator and inspect it for trapped debris or mineral buildup.
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