great topic David, and one that has become close to my heart recently as well.
I also believe in ONR, thanks to the people on here, and have sold off all my conventional products and converted primarily to ONR. In the UK we have a different water situation with legislation, but no real differences in the mechanics of drainage. I recently 'walked' the journey of my surface water drains, and posted it on DW
here (I hope you dont mind the link

) and although I live about as far as its possible to get from the sea in the UK, it still doesnt take long before the wash water from my driveway reaches the local wildlife
I'm also about to start trying a waterless product and dont see the math in quite as bad a light as you suggest.... My washing machine only uses 20 gallons per wash (still more than an ONR wash obviously) but it is also suggested I only need a few MF's per car, and my estimate is that I could run 1 wash cycle for 4-5 clean cars. In reality that is pretty much the same amount of wash water. The waste from my washing machine goes to sewage disposal and is readily broken down in there. I just havent proven to myself yet that this is a safe wash process, but we'll see.....
Great discussion and I look forward to following it and seeing the comments of others. I do believe that there will have to be change, and that in the UK, Europe and US its inevitable that change will come, and our age-old wash methods will soon become obsolete from legal, environmental and technological advances
