We have a park without sub-metered water. We get three bills/month for 30 homes. Each meter serves 10 homes. In the winter all of the bills are the same but in the summer one of the bills triples and is over twice the other bills. We have had a plumber do simple repairs in all of the homes such as flappers, leaky faucets, etc. We have also checked the main lines and have no leaks. We have had two separate plumbers bid for sub-metering the water; both of whom gave bids of $1000-1200 per site because the water line they have to tie into is under the houses.
How is the best way to get the water bill under control?