In the eastern half of the county, most wells in valley bottoms produce enough water for domestic use. In the rest of the county groundwater becomes more scarce, with less than half of the wells drilled in valley bottoms able to produce enough water for a domestic supply. Throughout the county, wells on hillsides and ridges become progressively less productive away from valley bottoms. Most of the water from drilled wells is very to extremely hard and contains noticeable amounts of iron. Salty water is commonly found in wells drilled 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 gallons per minute.