About this map

Storm drains were designed to be the fastest and most efficient way of getting rainwater off streets and parking lots.  Unfortunately, the water that flows into your storm drain carries trash and sediment from the street, nutrients in the form of fertilizers, and toxics in the form of pesticides, household cleaners, gasoline and motor oil.  All of the water in the storm drains ends up in your local stream or river.

Source:  Maryland Department of Natural Resources Website