I recently posted a thread asking advice about a water leakage problem I had and I am glad to report that we found the leaks, (thanks to some good advice from fellow members) repaired them and last month our bill was 700 baht compared to the previous month's of 4,200.00 Baht.
My great relief was shot to pieces yesterday when my wife reported that this month's bill was 3,850.00 baht.
I checked the repair areas and found everything OK and I suggested that my wife go to the water board department and check what the f##k was going on.
She returned with the following explanation: The council metre was not working when the metre reader checked it so they took an average over the last 6 months and prepared the bill accordingly.
So beware one and all.
If in doubt don't be afraid to ask.