The Dakota Sandstone doesn't actually "have" water. It's a rock formation, not a water source. However, the Dakota Sandstone can be a source of groundwater.

Here's how that works:

* Porosity and Permeability: The Dakota Sandstone has a high porosity (lots of spaces within the rock) and permeability (the ability for water to flow through those spaces). This makes it a good aquifer, which is an underground layer of rock or sediment that can hold and transmit groundwater.

* Water Source: The water within the Dakota Sandstone comes from precipitation. Rainwater seeps into the ground and eventually reaches the Dakota Sandstone, where it is stored.

* Location: The Dakota Sandstone is found in many parts of the United States, including the Great Plains, the Rocky Mountains, and the Midwest.

Therefore, the water within the Dakota Sandstone comes from precipitation that infiltrates the ground and is stored within the rock's porous structure.