“Women and girls, like the one I met in Zambia, bear most of the burden of lack of access to clean water and adequate sanitation. Women are more than twice as likely as men to be responsible for water collection, and on average, women in the developing world walk three and a half miles each day to collect water—time that could be spent in school or at work.

“Economically, water is one of the smartest poverty-fighting investments we can make. My friend Ben Affleck and I met with the World Bank and the Millennium Challenge Corporation (MCC) in Tanzania, and we saw how a lack of good water infrastructure is holding back businesses. We talked to Prosper Mbarewoai of Allied Chemicals, who estimated his detergent-production business is operating at only 60% capacity because he spends anywhere from two hours to an entire day just getting water.

“The MCC in Tanzania is working to revamp the water treatment and supply infrastructure in two major cities, decreasing the risks of water-borne illness and enabling business productivity. In fact, every $1 spent on water and sanitation generates a return of $8 in saved time, increased productivity and reduced health costs in Africa.