Your “Sanitary Sewer Line” is the sewer line that connects your home to the public sewer system. Wastewater from your toilets, sinks, showers, and washing machine travels through your sanitary sewer line to the public sewer main line which carries it to the nearest wastewater plant for treatment. If your sanitary sewer line is broken or leaking, raw sewage could be seeping into the groundwater. Groundwater passes to your neighbors’ yards, to creeks, to streams, into Long Island Sound and the Atlantic Ocean.