According to Wisconsin Plumbing Code, nearly anything fixture that handles cleaning agents must be drained to the sanitary drain (the septic tank/system).  This includes sinks, showers, washing machines, dishwashers, etc. This that may be able to be drained to grade (not in the septic system):  Condensate from furnace, air conditioner, drainage sump pump discharge, dehumidifier [...]

Some may question whether a home inspection is necessary for the purchase of a condominium unit. A condo is just as much your home as a free standing, single family home. Condominiums are unique  because you are typically responsible for the interior of your home while the association is responsible for the exterior (generally speaking). [...]