Experiencing low water pressure when running only two faucets simultaneously is usually caused by partially restricted supply pipes (such as mineral scale buildup in older galvanized pipes), a failing pressure-reducing valve (PRV), or undersized supply lines that cannot accommodate multiple fixtures drawing water at once. When demand increases, water flow splits, causing a noticeable pressure drop at individual taps. Verification: Open multiple fixtures across the house to see if pressure drops uniformly, and inspect main shutoff valves.
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