A new WHO study provides “more updated and comprehensive figures than have been previously available of the costs of attaining the MDG target for water and sanitation” . “From 2005 to 2014 approximately US$ 70 billion needs to be spent annually on water and sanitation in the countries included in this analysis, of which US$ 18 billion is on increasing coverage to the currently unserved population, and US$ 52 billion is on maintaining and renewing existing facilities for populations already with water supply or sanitation coverage. This US$ 70 billion price tag translates to a developing region average per-capita spending requirement of US$ 120 over a 10-year period (2005 to 2015), or US$ 12 per capita annually. Given the lack of up-to-date data on actual combined spending by governments and households on water supply and sanitation in developing countries, it is not possible to estimate the current financing gap at the global level”.
 Hutton, G. and Bartram, J. (2008). Global costs of attaining the Millennium Development Goal for water supply and sanitation. Bulletin of the World Health Organization ; vol. 86, no. 1 ; p. 13-19.