I've been dripping for over 3 years,
I am dripping about 170-200 gallons per day between all tanks.
My water bill is about 80-100 bucks, this also includes trash and I have sprinkler system with over 1/3 acres of grass area..
On the average I used about 6000 gallons per month at $3.75 per 750 gallon, it's no more than $30 ish extra of water per month.
I don't run heater on any of the tanks, my electricity with 2400 sq ft home keeping 73-75 degree constant is varies from $ 150 for spring and fall to $ 230 for summer.
Similar sized home (neighbor) without any fish tanks is about $ 50 less than mine...so figure about $ 50-75 extra a month for fish tanks.
I have a 575, 120, 75, 4- 40 breeder, 3- 20 gallon
it does get to about 105-110 degres in the summertime.
Stan