I just buy my water from someone. Last time I run a RO from my old house, someone shopped me to the water company and I had to start paying commercal rates. Happyier to buy it.
your joking 
I'm on a water meter and don't think there is such a thing as commercial rates I just pay for what I use charged at same rate as domestic.
Being "commercial" though does mean I am entitled to a rebate on the sewrage charge for the pure water.
Would think it a lot more expensive to buy water. My water bill has increased around £500 (tax deductable) a year and I work 5 full days a week. How much do you spend a year buying water?