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  • Selenium 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.0.48 ppb1.8 ppbNo50 ppbNo50 ppbNOTE: Each dot in the above graph represents one month.* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL).
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