Most wells in valley bottoms produce enough water for a domestic supply. Fewer than half of the wells drilled on hillsides are adequate for a domestic supply. Wells on hilltops and ridges yield smaller quantities of water. Most of the water from drilled wells is extremely hard and contains noticeable amounts of iron. In the northeast and southeast half of the county, salty water may be found in wells drilled into bedrock less than 100 feet below the level of the principal valley bottoms. A few springs supply enough water for domestic use. Almost all springs yield less than 5 gal/min.