Nonpoint sources , such as urban and suburban storm water runoff, are significant sources of chemical contaminants. Air pollution is a source of chemical contaminants. The primary sources of chemical contaminant loads to the Bay vary depending on the chemical. Sources of chemical contaminant loads vary by watershed. In order to reduce chemical releases, Bay managers are working to identify and target sources of chemical contaminants.
Chemicals travel through the watershed and are eventually deposited in the Bay or rivers.
For example, oil and grease from a parking lot can be washed down a drain by stormwater and into a stream, eventually leading to the Bay. These types of diffuse pollution, or nonpoint source pollution, are difficult to control. Chemicals from point sources come from a pipe, and these loadings are usually easier to reduce via management and regulatory measures. Be aware of the chemical contaminants in your household products. Use alternative products that contain less toxic pesticides, cleaning products, paints, etc. to reduce the amount of household hazardous waste.