Barium is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.32 ppb32 ppbNo700 ppbNo2000 ppbChromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.6.4 ppb6.4 ppbNo100 ppbNo100 ppbNOTE: Each dot in the above graph repres