We were paying around $240 every two months for an 1800 sf house with 2 adults, 2 toddlers, and an almost all usable-space 10,000+ sf lot. We had a fair amount of laundry, and I like long showers, but I think that the biggest culprit is that my husband is pretty much hose and sprinkler-happy and our lawn was always really green, even in August.