A major storm water quality concern is "non-point source pollution". As the name implies, non-point source pollution comes from numerous locations and is carried through water runoff. The types of pollutants include toxins, metals, oils, nutrients, and fecal coliform bacteria from septic systems, leaking sanitary sewers, farm animals, and pets. These directly impact water quality and now represent a large percentage of the pollution picture. Street sweeping, elimination of septic flows and leaking sanitary sewers, and increased cleaning of storm drains can control these pollutants.