All things water is a major concern for a builder. Especially in the crawl space.
I drive a lot. When I drive I listen to the radio. A day does not go by when I hear advertisements for fixing crawl spaces. The companies advertising are very aggressive in pitching nice clean crawl spaces that drain well. They don’t tell you how much it costs to do the fixes. They save that for when they visit your home. I’ve heard they range between $6000 and $30,000.
I find it odd that there are very successful businesses fixing crawl spaces.