Low water pressure affecting only one specific bathroom while other bathrooms maintain strong flow is typically due to localized fixture obstructions or valve issues. Potential causes include heavy hard water mineral scale buildup clogging the aerators or showerheads in that specific room, partially closed individual supply shut-off valves under the vanity, or a restricted branch supply line feeding that particular bathroom wing of the house. Because the rest of the plumbing network operates correctly, the main water supply and pressure regulator are working fine. Verification: Inspect and clean the aerators and showerheads in the affected bathroom to see if normal water pressure immediately returns.
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