Whats the difference between the sanitary sewer system and the storm sewer system?
The sanitary sewer system is a network of pipes that carries wastewater from the toilets, sinks, and bathtubs/showers in your house to the treatment plant, where the wastewater is cleaned before entering the Concord River. The storm sewer system, or more commonly known as the storm drain, is a network of roadside ditches, gutters, and underground pipes that collects stormwater (water from rain and melting snow that flows over the ground) and carries it away from our streets, parking lots, and yards. Water enters the storm drain system through catch basin grates and exits through outfalls. Where does water in the storm drain system go? Stormwater carried by the storm drain system directly enters water bodies throughout Town, including the Concord River, the Shawsheen River, Nutting Lake, and Winning Pond. Sometimes stormwater flows into wooded or wetland areas of Billerica. Remember – stormwater is not treated at the wastewater treatment plant. Any pollution that is washed into the stor
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