A damp patch on a basement wall might disappear after a few dry days, only to return during the next storm. You could paint over it, run a dehumidifier, or fill a nearby crack, but none of those steps will necessarily stop the water from coming back. The difficulty is knowing whether moisture is passing through the foundation, collecting beneath the floor, or forming on a cold surface....
A sump pump is designed to move water away from your basement before it becomes a serious problem. But when the groundwater level stays high, the pump may have to work much harder than it normally would. Instead of handling water only after heavy rain, it may run regularly because groundwater is constantly pressing toward the foundation.
This can affect how often the pump runs, how long it...
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