A lot of the pollution in our rivers starts out in our yards and driveways. All over the city, small volumes of pollution produced from everyday activities are conveyed to our streams and rivers by runoff. You might be surprised to learn where pollutants that affect stormwater and runoff come from. You might think, for example, that swimming pool water is fairly pure. But it contains chemicals, such as chlorine, that can be harmful.
Although we don’t cover every source of stormwater and runoff pollution here, we have tried to discuss the most common ones. See below for more information about sources of pollution. There are many simple steps that can be done to reduce the impact to our environment.