Surface water—everything from undiverted rainwater to leaky systems—can cause a flooded basement. (Not to mention other probable causes like overflowing rain gutters and backups in the storm or sewer water systems.)
It may not be as obvious as large sources of water like rain or pipes, but one of the biggest culprits of water seepage is the moisture-filled earth that surrounds your basement. Regardless of the material that was used when building the structure—bricks, concrete, stone—it can be susceptible to seeping water when the ground puts pressure on the walls and forces moisture through tiny cracks and joints.
A flooded basement can also be the result of something more catastrophic and quicker like a burst pipe or a heavy rain storm.
Regardless of the cause, a flooded basement presents serious structural and health risks to you and your family.