Updated: January 15, 2021
By Krisztian Varsa , Jennifer Dindinger , Amanda Rockler , and Jacqueline Takacs

Impervious surfaces* such as roofs, increase runoff by preventing rain water from being absorbed into the ground. In precipitation events, stormwater runs over impervious surfaces and picks up pollutants such as nitrogen, phosphorous, suspended sediments, organic chemicals, heavy metals, and oil which are washed directly into our storm systems and local waterways.

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