Stormwater is precipitation that falls on impervious surfaces—roofs, parking areas, and roads, and flows off these surfaces until it finds a storm drain, a waterway, or a place to soak into the ground.
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Stormwater runoff is precipitation in an urban or suburban area that does not evaporate or soak into the ground, but instead runs across the land into a storm drain or the nearest waterway.
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Stormwater runoff has been identified as the number one cause of pollution to rivers and streams (the source of drinking water).
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Stormwater is runoff from precipitation, snowmelt, surface runoff and drainage.
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Stormwater runoff can pick up motor oil, fertilizers, pesticides, de-icing salt, chemicals, leaves and yard debris, animal waste, litter, and sediment and carry it into storm drains and into waterways.
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