Yep, I get about 13,500 gallons which is high but not impossibly so. That comes out to a bit over 400 gallons a day.
What're your family size/water use habits? Do you have water-saving fixtures? Do you water your yard? (I think that's the key there!)
If you have, say, 6 people showering a day (2.5 gal*10 min *6), that's 150 gallons. Add in toilets/sinks/dishwasher plus a few loads of laundry (call it 50 gallons each wash load), and you're probably right around 200-250 gallons a day. Any amount of watering, car washing, etc. would increase that rather quickly.
I just dug out some of our old bills... looks like we use around 7-8,000 gallons in months we don't water the yard (underground sprinkler system, plus manual watering of flowerbeds with hose which at least doubles our water usage if used heavily - e.g. in later summer). Comes to about $30 in non-watering months and $75-100ish in the summer.
We have 5 people showering, do plenty of laundry, run the (new) dishwasher daily, but do have water-saving showerheads (2.5 gpm), low-flow toilets (1.6 gal), and newer faucets.
Of course, ymmv, but I think the usage really depends on how many people in the home, and if you do outdoor irrigation.