How many gallons of water can one leaking toilet contribute to a monthly bill? 

The answer is: If the leak is one gallon per minute, the leak will use 1,440 gallons per day or, 43,200 gallons in a 30 day month! 

Mid Valley Metro suggests you check your toilets monthly. This can be accomplished with a few drops of food coloring dropped in the tank at the back of the toilet. Check back in 45 minutes — If you see the color, your toilet is leaking!