'Storm drain pollution’ is one of the leading causes of water pollution. Urban areas contain a high percentage of hard surfaces such as rooftops and pavement where water collects and quickly runs off. Urban Runoff is difficult to prevent because instead of originating from a single source, such as a factory or sewage treatment plant, the sources of urban runoff are spread throughout an urban area. Such sources include driveways, pavements, streets, construction sites and car parks. Any deposits of oil, grease, pesticides, herbicides, soil, pet droppings, etc. in these areas are flushed by rainwater and other means down the storm drains and directly into a river or sea.
