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A stormwater sewer is not treated; it goes directly to water body, pollutants and all. Stormwater sewers go directly to local water bodies without being treated. A sanitary sewer goes to the waste water treatment plant where the water goes through a complicated process where it is cleaned and released back into the water. Sanitary sewers go to a wastewater treatment plant to be treated before discharging into a local water body.
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