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Stormwater runoff comes from precipitation events and when snow/ice melts onto impervious surfaces. An inch of rain on an acre of land is equivalent to 27,154 gallons of water with a weight of 113 tons. This water transports many pollutants, including but not limited to sediment, oil, grease, fertilizers, bacteria from pet waste, and litter/trash. Stormwater DOES NOT get treated prior to being flushed into waterways.