On its face, that makes perfect sense — especially given the severe drought facing so many areas of our country right now. And why not? Greywater draining from bathtubs, showers, lavatory sinks, automatic clothes washers and laundry tubs is not contaminated with fecal matter or urine, so why not use greywater twice? Carefully constructed code-compliant greywater reuse systems, while not in use in every home, are not all that scarce either.
Potable drinking-quality water comprises just one-half of 1% of the earth's available water! Millions of people throughout the world will go without a single source of clean drinking water today. We're seeing areas of our own country that have reached, or are already in, the beginning stages of a full-blown water crisis. Toilet-to-tap? Why not? If the International Space Station can recycle human waste to potable water quality, why not for municipalities that are starved for water? Los Angeles is poised to do exactly that; just don’t you dare call it toilet-to-tap.