Part of the process of installing your new water meter will be checking water cross-connections and sump pump discharge connections.
A cross-connection is any temporary or permanent connection between the potable (i.e., drinking) water system and another source containing non-potable water or other substances that could contaminate your drinking water if a backflow condition occurs.
Sump pumps are not allowed to drain into the City's sanitary sewer system. While this might seem like an easier option than running a discharge tube from the sump pump to the exterior, it is illegal when the home is connected to the city sewer. During larger storm events, the sewage treatment facilities can be overloaded causing either sewage backups into peoples' homes, or the sewage water only gets partially treated before being dumped into local streams and rivers.
Brochure Regarding Cross-Connection Hazards