I would increase your sewer bill at least six times greater than the current rate . If they are connected, disconnect them and provide a means for the downspout to drain to a natural drainage way or dry-well constructed on your property. Do not connect a sump pump discharge to the sanitary sewer system unless it is only used to discharge a washing machine. If the leaking wall cannot be waterproofed, or grading of the lawn will not prevent the wall from leaking, the drains should be disconnected from the sanitary sewer and a sump pump installed to discharge the drain water to a natural surface drainage way. Disconnect any carport drain from the sanitary sewer and provide a method to discharge this water to the surface.
Disconnect foundation drains from the sanitary sewer system.
Do not permit anyone to connect the foundation drain to the sewer system. Foundation drains should either be connected to a dry well or drain to the surface. If neither of these methods is feasible, then the foundation drain should be connected to a sump pump and discharged to a natural surface drainage way. Notify the County Utility Department when you notice other people making improper connections to the sanitary sewer, or if you notice any part of the public sewer system that is being flooded by surface water or that has been damaged so as to permit surface water into the system. It is irresponsible and illegal for anyone to knowingly introduce surface or ground water into the sanitary sewer system.