There's wide political support for a major infrastructure spending plan. That could be a huge boon to the regulated infrastructure owned by water utilities.
https://www.fool.com/investing/2017/07/04/how-water-stocks-could-benefit-from-a-1-trillion-i.aspx
Michael Burry from the "Big Short" has been investing in water related companies as well for the past several years:
http://www.valuewalk.com/2016/10/water-investments-michael-burry/