This sounds interesting, because as someone from the West, I have no concept of what it means to "buy" water. We completely take for granted the fact that every single house has access to clean water. One thing, in SF I am also paying more for water than electricity, it comes out to about $60/month for water and $45/month for electricity.

How do you protect customers from sellers who have poor quality or poisonous water who try to game your system? Do you do water testing as well?