During a severe storm power outage, a sump pump alarm sounds because the electrical grid failure has cut power to your primary sump pump, allowing rainwater to fill the sump pit basin past the safe threshold and trigger the battery-powered alarm's float sensor. Unless you have a functioning battery backup sump pump system installed, the primary pump cannot run without generator or grid power. Verification: Check your main electrical panel, verify backup battery status, and inspect water levels inside the pit.
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