Some water does not fall in. It rises up.

Groundwater Seepage: diagnosed and explained.

Groundwater seepage is water arriving from the soil itself rather than from a leak or a storm you can point to. After wet weather, the ground around and beneath your home holds water, and that water moves toward any space with less pressure, which includes your crawl space. It rises through the soil floor, wicks up into concrete piers and stem walls, and pushes through cracks and cold joints in the foundation perimeter. The result is a crawl space that stays wet long after the rain stops: darkened damp soil, water staining low on the stem walls, white mineral deposits where moisture evaporated out of the concrete, and in heavier cases, water actually weeping through cracks. Seepage matters because it is patient. It keeps the soil under your supports soft, it keeps humidity high enough to rot posts and girders, and it feeds the swell half of the clay cycle that moves piers out of position. It also does not fix itself, because the source is the water table and the drainage pattern of your lot, and neither of those changes without help. The good news is that seepage responds very well to drainage done correctly on the surface, where it is far cheaper to manage water than under the house. Seepage cannot be caulked away, because the supply is the ground itself. The workable strategy is management: lower what reaches the house with exterior interception drains, keep roof water from recharging the soil beside the foundation with downspout runoff extensions, and give what still rises a controlled path out via under house drainage matting routed to an exit away from the house. How the layers fit together is covered on the waterproofing service page.

For the repair side of this, the crawl space repair solutions page lists every method Dalinghaus installs, including the ones that fix problems other than groundwater seepage.