| http://www.w3.org/ns/prov#value | - m is a naturally occurring element that contaminates water due to mining or petrolum refining, fly-ash from coal-burning power plants, and irrigation of arid farmland soils high in selenium.2.28 ppb4.8 ppbNo50 ppbNo50 ppbChromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.3.33 ppb10 ppbNo100 ppbNo100 ppbChlorof
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