Running toilets, which may waste up to 200 gallons per day, and leaky faucets, which can drip up to 20 gallons per day, are the main reasons of high water bills. Examine your faucets for leaks, remove the tank from your toilet, and listen for any hissing or other sounds. Check your water line and hose bibs if you can’t detect leaks in either of those areas. Consider contacting a plumber in Toronto as well.