The agency picked up the account after a pitch against two other shops, and will now be responsible for launching a series of TV, press and digital campaigns to help build the charity's profile and boost its number of donors.
In the UK, WaterAid has previously used Kitcatt Nohr Digitas for advertising projects. R/GA was appointed last week to work on global activity. In August last year, Kitcatt Nohr rolled out an online video campaign for WaterAid to highlight the difficulties faced by people living in areas of poor sanitation.
Jennie York, WaterAid's supporter recruitment manager, said: "The Good Agency excited us with its excellent strategic approach, creative delivery and understanding of our organisational needs."