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Some forms of pollution — like muddy runoff — are easy to see. Others — like oily spots in a parking lot — are so ubiquitous that we hardly give them a second notice. But that oil, like the pesticides being sprayed near a storm drain (above), will eventually be washed into the nearest stream.

What is non-point pollution?
Non-point source pollution — comes from overland flow of water (rainfall runoff, snowmelt, other water). Potential Sources include —