Without details of the house, these are general statements. (1) Improve the drainage plane around the house (dirt) to shed water away from the house. Your house should be the highest point, by many inches, within 30' of it, IMO. (2) Make sure gutters have spouts that run water at least 6' from the house. (3) Provide natural ventilation under the house, so if any water "appears" it can dry. (4) Hope you are not on top of an spring.