Storm water runoff doesn’t cause pollution, humans cause pollution. Storm water is just a good carrier of our pollution into waterways. The most common pollutants correlated with storm water are from fertilizers. Farmland usually takes much of the blame for excess nutrient runoff into a watershed, but in truth, urban and suburban areas contribute to more nutrient pollution than do farmlands. Nutrient pollution causes severe eutrophication of our oceans and lakes. This means massive algal blooms which choke the water of its oxygen, making dead zones in which animals cannot live. Storm water also can carry with it toxins from mining zones which can dirty drinking water. This is especially a problem with coal mining in rural areas of West Virginia. In considering human health, this would probably be considered the worst type of pollution carried in storm water runnoff.
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