Mychart Northeast Iowa Rentals. Rentals Details: Mercyone Waterloo Mychart Rentals.Rentals Details: MyCare Waterloo, Iowa (IA), MercyOne Northeast Iowa.Rentals Details: If you are a MercyOne patient and visit any of our clinics in northeast Iowa, MyCare is an online tool that gives you direct access to your personal health information.Your lab results, provider appointment information ....