Sump pumps and other illegal connections cause major issues in the sanitary sewer.  Sanitary sewers are designed for wastewater only.  Water from sump pumps, downspouts, outside surface drains and others can flood the public sewer system very quickly.  An average sump pump running for 4(four) hours a day can pump the same as about 30 house produce in one day.  Sump pumps connected to the public sewer system is a very large issue in several areas in the Iowa Great Lakes Sanitary District.  All the cities and the Sanitary District prohibit the connections of sump pumps the sanitary sewer system.