rochemical and metal-finishing industries.1.2 ppm1.2 ppmNo10 ppmNo10 ppmSelenium (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.10 ppb10 ppbNo50 ppbNo50 ppbDibromoacetic acidDibromoacetic acid is a disinfection byproduct regulated by EPA as on