Dry Basement Iowa has been solving basement water problems for over 10 years and we have the solutions to fix any basement flooding issues your home might be facing. Water in your basement normally comes from one of three sources : These are groundwater, interior moisture sources, and ventilation with humid air. If the source is rain or groundwater, it means that water outside has now found its way inside your basement. Having an interior drainage system installed in the basement will help direct water intrusion to the sump pump pit for discharge out of the basement.