HomeEducationNonpoint Source Pollution

# Urban and Suburban Areas

## Pollution Tutorial

*Most nonpoint source pollution occurs as the result of runoff from rain or melted snow.*

Runoff from urban and suburban areas is a major origin of nonpoint source pollution. Much of the urban environment is paved with asphalt or concrete, or covered with buildings. These surfaces are usually impervious, meaning that water runs off of them without being absorbed into the soil. These hard, impervious surfaces make it easier for stormwater to pick up, absorb, and carry pollutants.

Other environments in urban and suburban areas also add to nonpoint source pollution. At construction sites, soil that has been disturbed or piled up without being contained can easily erode. Discarded construction materials (plastics, wood, oils, trash) can also be carried away from these sites by runoff waters.

In suburban areas, the chemicals used in lawn care, and even pet wastes, often end up in runoff and contribute to nonpoint source pollution. In many towns and cities the water flowing into storm drains is not treated before emptying into nearby waterbodies. That's why many municipalities, like those in suburban Maryland and Virginia that border the Potomac River and Chesapeake Bay, are painting words like "It Ends Up In The Bay" in large bright letters across their storm drains. This reminds residents in towns more than two hours away from the Chesapeake Bay that their very own nonpoint wastes, no matter how small, eventually contribute to polluting the great bay.

Many municipalities that border the Potomac River are painting words like "Drains to the Potomac" across their storm drains. 

### Pollution Lessons

              - Welcome
              - A Brief History of Pollution
              Categories of Pollution
              - Point Source
              - Nonpoint Source
              - Urban and Suburban Areas
              - Agricultural Operations
              - Atmospheric Inputs
              - Forestry and Mining Operations
              - Marinas and Boating Activities
              Pollutants from Nonpoint Sources
              - Nutrients
              - Suspended Sediments
              - Pesticides and Toxic Chemicals
              - Bacteria, Viruses, and Trash
              - Research, Monitoring, and Assessment
              - Controlling Nonpoint Source Pollution
              - What You Can Do
              - References
              - Roadmap to Resouces
              - Subject Review (PDF)

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