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It is mostly inorganic in nature with gasoline, motor oil, heavy metals, trash and other pollutants from roadways and parking lots.

Impervious surfaces (roads, parking lots and sidewalks) are constructed during land development which results in high amount of surface runoff.

This runoff is a major source of flooding and water pollution in urban communities worldwide.

Urban runoff is surface runoff of rainwater created by urbanization.Organic pollution may refer to the concentration of organic compounds in water including dissolved and suspended biogenic substances from aquatic and terrestrial species. Water pollution occurs when harmful substances, chemicals or microorganisms contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.