---so many people to serve and so little time ---
According to the World Bank (link below, pdf page 44) the immediate need for water at the basic level is estimated to be on the order of 800 million in 2019. But the the number of people that must be served to attain safely managed water for all the world is 4,500,000,000 (4.5 billion) people by 2030. -----That means that more than 1,200,000 will need to be served Per DAY to meet the higher level goal of "safe water" from now to the year 2030.
LINK TO WORLD BANK REPORT