Stormwater is the flow of water on the ground immediately after precipitation – rain or snowmelt.
After a rainfall, some of the precipitation is infiltrated into the soil, some of it is taken up by plants, and some is evaporated back into the atmosphere and the rest runs off land surfaces and other impervious areas. Unfortunately, the stormwater run off picks up any oil, grease, chemicals, nutrients, metals, even bacteria as it travels across land. Heavy rainfall or snowmelt can cause sewer overflow, which will also be carried by the stormwater. All of these chemicals and pollutants will then enter our lakes, rivers, and streams.
Where does stormwater go? Stormwater is either drained into our drainage systems which carry that water into rivers, lakes, or streams, or it is directly carries into our waters. 
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