Although the outward signs may vary, water seeping into your basement or crawl space can usually be traced to the same basic cause - the expansion and contraction of the walls and foundation due to fluctuating temperatures. Over time, cracks can begin to develop, allowing the ground water to seep in. Although faulty construction can sometimes contribute to the problem, more often than not it's simply a matter of nature taking its toll.

There are other causes to be sure. For instance, poor drainage near the foundation wall can create significant problems. One of the more common problem areas is at the base of the foundation wall where it meets the footer. The footer and wall are constructed separately, and it is virtually impossible to get a perfect seal at the joint. Once again, fluctuating temperatures can create movement at the joint that results in an open invitation for water to seep in. 

When the ground becomes saturated, the rising water table can exert tremendous pressure under the basement floor and against the foundation walls. Water is a very powerful and persistent force that can - and often will - find its way into your home.