Go to the Farmington website and call the dept. of public works. Since you are not the home owner they can not give you specific info, but, they can give you the average. Same with Connecticut Light & Power. The numbers are on the website.
Remember, everyone's usage is different. Some people do laundry and run the dish washer a few times each day, take 20 minute showers, water plants & grass, wash their cars at home, etc. That will drive water/sewer usage up. Same with electricity. How many refrigerators, computers, ovens, clocks, lights, etc do you have? You can not get away from a bill unless you are off the grid. You can just control your usage.
If you buy a home with a well/septic there is still a cost. Pumping the tanks every couple of years, having to replace the tank & leach field every 30-40 years, possibly having to re-drill or frack your well, just to name a few. These are all unwritten issues of owning a home. Let's face it: home ownership is not for the faint of heart.
Linda M. Byrne