No, it is not normal for a healthy sump pump to be excessively loud. While a normal submersible sump pump produces a low, muffled motor hum and the sound of rushing water through the discharge pipe, loud grinding, squealing, rattling, or roaring noises indicate underlying mechanical problems such as worn motor bearings, cavitation, or pipe vibrations. Verification: Compare your pump's operational sound against a smooth motor hum during a manual test with a bucket of water.
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