I suspect you would be surprised how much water you use - for a family of 3, we use about 2000 per month and don't water the lawn or anything exciting - just showers, laundry, dishes, drinking, whatnot.
Also, it's some amount of money a month on electricity for the pump - even if it's $10/month you are still WAY lower than most folks' bills, but still it's a cost that those on town/city water don't have to pay since it's gravity-forced into their house.
Also, it's some amount of money a month on electricity for the pump - even if it's $10/month you are still WAY lower than most folks' bills, but still it's a cost that those on town/city water don't have to pay since it's gravity-forced into their house.