let's talk about those.

things like rooftops gardens that filter rainwater before it's had a chance to go to collection ponds (for drinking or other uses).

raingardens on the ground, on the fringes around parking lots and other impermeable surfaces to again, treat runoff before it enters "the system".

"home treatment plants" consisting of a system of containers, whereby personal water can be cycled through "mini wetlands" and the like.