The amount of water you use affects your usage charge. When you use less water, you pay less. You can get the biggest water savings in your home by installing efficient fixtures and fixing leaks. A constantly running toilet may waste about 8 gallons per hour, or 200 gallons per day. Left unnoticed, a running toilet could waste over 6,000 gallons per month. Ensure you are only watering the lawn when needed and adjust your sprinkler system, so you are not watering the gutters.