Selected chemical quality characteristics in streams of Kentucky, 1970-1975

Generalized maps of average dissolved solids, hardness and nitrate concentrations of water in streams throughout Kentucky were prepared from data collected at more than 100 sites from 1970 to 1975. Average dissolved solids concentrations seldom exceed 250 milligrams per liter. Hardness, mostly of calcium magnesium origin, generally ranges from 60 to 180 milligrams per liter. Average nitrate concentrations exceed 2 milligrams per liter at most of the sites. (USGS)