Crawl space moisture and crawl space water problems are not always easy to detect, unless of course you look in your crawl space and see water. The best time to check is in the rainy season while the ground is saturated. Don’t make a guess, water can come and go in a few days, weeks or months. Know what you are dealing with and where the moisture in your crawl space is coming from so that you can fix your crawl space water problem right the first time. 8 out of 10 crawl spaces have water or moisture issues. Dry crawl space or swimming pool, your choice.