Success Story. Because of rapid urban migration in Mozambique, many of the country's municipalities responsible for water supply and sanitation infrastructure struggle to manage aging structures and provide adequate service to users'but this is changing. Water and sanitation play an essential role in economic development, which is why one of the Government of Mozambique's top priorities has been working with the Millennium Challenge Corporation and other donors to implement policy, regulatory and institutional reforms in the water sector and to invest in the water supply and sanitation infrastructure.