13h 18min, jan 1, 1987 y - "The act has been amended many times, most significantly in 1987 to ramp up controls on toxic pollutants, and in 1990 to more adequately address oil spills after the Exxon Valdez disaster. This is the Clean Water Act. On some levels, the Clean Water Act has been a success. Gone are the days of river fires, and the legislation has stopped countless millions of pounds of pollution from entering our waterways."