| http://www.w3.org/ns/prov#value | - um is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.42.5 ppb50 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.5.5 ppb11 ppbNo100 ppbNo100 ppbCopperCopper is a naturally occuring metal
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