Cities
Villages
Madison Metropolitan Sewerage District communities
The Madison Metropolitan Sewerage District lists 24 customer communities in its service area (Madison Metropolitan Sewerage District, Service Area). It runs a sanitary-only sewer system and says sump pumps, gutters, roof drains and foundation drains should not be connected to it; those connections are prohibited (Madison Metropolitan Sewerage District, Inflow & Infiltration).
The District warns that clear water getting into the sewers during big storms can overload the system and cause sewer backups into homes (Madison Metropolitan Sewerage District, Inflow & Infiltration). Where a sump may discharge instead is up to each city or village, so check with yours before rerouting it.
The communities on this site that the District lists as customers: