| http://www.w3.org/ns/prov#value | - ts, and irrigation of arid farmland soils high in selenium.1 ppb2 ppbNo50 ppbNo50 ppbCopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.3 ppb3 ppbNo300 ppbNo1000 ppbNOTE: Each dot in the above graph represents one month.* Water utilities are noted as exceeding the legal limit if
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