The water hardness level in Kentucky varies depending on the region. Generally, the water in Kentucky is considered moderately hard, with an average hardness level of around 120 mg/L calcium carbonate equivalent. Some areas, particularly in the eastern part of the state, may have water that is considered hard or very hard, with higher levels of calcium and magnesium ions. It's recommended to have a water analysis done to determine the specific hardness level and whether a water softening system is necessary.