During 1979-84, 35 wells completed in the principal aquifer in the Salt Lake Valley, Utah, that had been sampled during 1962-67 were resampled to determine if water-quality changes had occurred. The dissolved-solids concentration of the water from 13 of the wells has increased by more than 10 percent since 1962-67.
United States Geological Survey, "Chemical Quality of Ground Water in Salt Lake Valley, Utah, 1969-85" (1986). All U.S. Government Documents (Utah Regional Depository). Paper 219.