Low water pressure restricted to only one single faucet is almost always caused by localized obstructions or valve restrictions. The most common culprit is a clogged faucet aerator screen packed with mineral scale, calcium deposits, or pipe sediment. Other potential causes include a partially closed individual hot or cold water supply shut-off valve located underneath the sink cabinet, or a jammed, failing single-handle faucet mixing cartridge that prevents full water flow. Verification: Unscrew the faucet tip aerator and clean out any trapped debris to see if normal pressure immediately returns.
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