An estimate developed by Booz Allen Hamilton in 2005 projected that between 2005 through 2030, modernizing and expanding the water, electricity, and transportation systems of the cities of the world will require approximately $41 trillion.
Of this 55% or $22.6 trillion will be required for water infrastructure. Thanks to Chris Maeder for pointing me to this.
US
The ASCE Report Card for 2009, which assigned a grade of D- to both drinking water and wastewater infrastructure in the US, has estimated that the total investment required in water and wastewater in the US over the next five years is $255 billion or 12% of the total $2.1 trillion required to modernize US infrastructure as estimated by the ASCE.
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