United States Environmental Protection Agency personnel accidentally caused a spillage (aftermath pictured) of 3 million gallons (11 million litres) of mine waste water and tailings trapped inside the Gold King Mine near Silverton, Colorado. United States Environmental Protection Agency: The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on December 2, 1970, after Nixon signed an executive order. The order establishing the EPA was sent to the House and Senate in accordance with the Reorganization Act of 1949, in which they had 60 days to pass a disapproval resolution or the order would take effect. Congress did not pass a disapproval resolution, and the order establishing the EPA went into effect. August 5, 2015. Wiki link