... 80% reductions are 'normal' once water/energy efficiencies completed using current technologies and strategies.  I think the joke is on you bro ... for not knowing that already.

I was able to achieve 80% just by switching out toilets (Denver water paid for 'em), faucets, showerheads (Denver water provided both), and outdoor sprinklerheads.

ROIs in some cases months worth of time, other times a year or so.

Homes, businesses, and AG growing operations are ALL long term considerations!