This link provides some info on the rate structure:
http://www.districtgov.org/images/Proposed%20VCSA.pdf
I have a patio Villa and my water bill for last month was a little less than $20. I wasn't here for the majority of time for that billing period. I have since adjusted my sprinkler system and of course I am here full time so I will have to see what that does to my bill. My irrigation usage was 1710 gallons.