Yes, a basement is highly likely to flood if your primary sump pump fails during a heavy rainstorm or high groundwater event. Without a functioning pump to evacuate water, hydrostatic pressure builds rapidly around the foundation, causing water to pour into the sump pit basin until it overflows across the basement floor. Installing a secondary battery-powered backup sump pump system prevents this risk. Verification: Test your primary pump and battery backup system regularly with a bucket of water.
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