You should call a licensed professional plumber for low water pressure if basic troubleshooting steps—such as cleaning clogged aerators, opening shut-off valves, or replacing whole-house filter cartridges—fail to restore normal flow. Additionally, call a plumber immediately if you suspect a hidden underground water leak, if your pressure reducing valve (PRV) is leaking or broken, if your well pump system fails to build pressure, or if you notice a sudden, unexplained spike or drop in your water meter readings. Verification: Consult a professional if pressure remains low across all fixtures despite checking main valves.
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