Yes, it can be entirely normal for a sump pump to cycle on every 30 seconds during torrential downpours, heavy rainfall, or rapid spring snowmelt. When massive volumes of groundwater saturate the soil around your foundation, water pours rapidly into the sump pit basin, filling it up almost immediately after each pumping cycle finishes. However, if your pump cycles every 30 seconds during bone-dry summer weather with zero rain, it indicates a mechanical malfunction, usually a faulty check valve. Verification: Check weather conditions and inspect the check valve flow direction if rapid cycling occurs on dry days.
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