Sumps are containers for water that seep into the weeping tile around the house. When the water table is high or under conditions of heavy rainfall, the pump will kick on when the water level rises above the pump float switch. If the pump is not working properly, the water could flood the basement. The frequency and use of a sump pump varies on location and is dependant on soil conditions and water table. Most service calls for sump pump replacements occur during the thaw of spring. This can be costly a expenditure if not properly maintained. Check your sump pump regularly to ensure it is working properly.