Low water pressure confined to a single bathroom is usually caused by a localized restriction rather than a whole-house supply issue. Common culprits include hard water mineral scale clogging the showerhead faceplate or sink aerator, a partially closed supply shutoff valve underneath the sink or behind the shower access panel, or a failing pressure-balancing cartridge inside that specific bathroom's mixing valve. Verification: Test multiple fixtures in that bathroom to see if the low pressure affects both the sink and the shower equally.
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