 Hi, I'm Benjamin Wilt, Communications Manager for Columbia Water. Did you know that a leaking toilet can waste up to 200 gallons of water per day and result in higher water bills? If you think you might have a leaking toilet, follow these simple steps. First, remove the tank lid and sit it aside. Inside the tank, there are three components. The fill valve, the overflow tube, and the flush valve. Do you see or hear running water at the fill valve? Next, see if any water is flowing over the overflow tube. When the tank is full, the water level should be about an inch or so below the top of the tube. If water is running over the overflow tube, adjust the fill valve float to control the water level inside the tank. If your adjustment does not stop the water from overflowing, the fill valve may need to be replaced. If there are no signs of leaking at the overflow tube, look for leaks at the flush valve by adding dye tablets or 10 drops of food coloring. Let the tablet dissolve for 5 to 10 minutes then look inside the bowl to see if there is any colored water. If there is, you have a leak. We have free dye tablets available at our Customer Care Center at 3000 Hardin Street. You can find components to repair your leak at most home improvement stores. We recommend that you check your toilets for leaks at least twice per year. If you have any questions, always feel free to reach out to our Columbia Water Customer Care Team at 803-545-3300.