Personally I like the clean water concept. Putting in solutions that work without a huge formal design and location, like constructing wetlands, using living machines, and groundwater rechargers. I know that not every community can use options like these yet, but looking forward I can see our industry adopting a lot of these new “more natural” techniques.
Have you heard of the Clean Water Fund? They really focus on these new techniques. You might find this fact sheet interesting: http://www.cleanwaterfund.org/files/NewParadigmFactSheet2.pdf