It really just depends on what is needed to remedy the situation. If the installation of a sump is required then it can be a bit costly if done correctly. Is the home near a river? In some areas the water tables are just higher than others and can cause periodic water entrance into the crawl space. Was it musty smelling or moldy? heavy staining on the crawl space walls or wood surfaces? Is this house located at the bottom of a hill(runoff)? Here in the NW, this is very common. And it really depends on each circumstance as to what approach to take.

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Rob Jones
ASHI member #212199
Washington State Structural Pest Inspector(SPI) 64730