The city of Golden Valley (MN) Web site offers the interactive Inflow and Infiltration in Golden Valley activity. This Flash based animation attempts to show homeowners how connecting a sump pump directly to the sewer system, besides being illegal, can cause other unforeseen problems. The characters explain that this could lead to higher water and sewer charges and even basement flooding of neighboring homes. Even though there isn't in-depth information on these subjects, the site does do a good job of explaining and illustrating how an average municipal sewerage system works, how a home sump pump works, and what happens to storm water.