Storm water pollution is the untreated contaminated water that drains off rooftops, yards, and streets flowing into the storm water drainage system. Pollutants are picked up as water (from rain, hoses, sprinklers, etc.) drains from streets, parking lots, and lawns and enters catch basins throughout the City. Any pesticides, petrochemicals, heavy metals, or other materials that are on these impervious surfaces have the potential of being washed into the drainage system. From there, the storm water flows through a system of pipes and open channels into streams and eventually into Lake Lewisville