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Here is the link to the Forbes article - https://www.forbes.com/sites/freddiedawson/2014/04/29/entrepreneurial-improvements-to-water-and-sanitation-could-cause-480bn-swing-in-global-economy/

I think WaterAid based their data on the 2012 report "Global costs and benefits of drinking-water supply and sanitation interventions to reach the MDG target and universal coverage"- https://www.who.int/water_sanitation_health/publications/2012/globalcosts.pdf

For more info on private sector business opportunities, you may wish to contact the organisers of the BoP World Convention & Expo and the Sanitation Business Matchmaking Estafetta - see https://www.ircwash.org/events/bop-world-convention-expo