We’re blessed in northwest to have such a mild climate and to almost never have a shortage of water.
But because of our abundance many homes in the northwest have water or drainage problems in their crawl space areas. Moisture in crawl spaces can come either from outside or inside. Inside moisture can seep down to the crawl space or outside moisture can be pushed up through the soil.
Which happens depends on the temperature of the crawl space vs. the outdoor temperature, and the pressure differences of the air, which can pull or push water vapor in the air, causing humidity.
Standing water and or humidity can create a variety of problems including providing a breeding ground for mold and also an attractive home for animals and bugs. In addition if you are selling your home it will not pass an inspection with water in your crawl space.