| http://www.w3.org/ns/prov#value | - 2 ppb30.2 ppbNo300 ppbNo1000 ppbSelenium (total)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.5.78 ppb5.78 ppbNo50 ppbNo50 ppbNOTE: Each dot in the above graph represents one month.* Water utilities are noted as exceeding the legal limit if any test
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