Here is a list that will help you detect water leakage in your toilet:
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1. Check the water meter before and after two hours when no water is used. If the meter does not show the same reading, it is highly likely you have a leak.
2. Leaky faucets can be fixed by checking faucet washers and gaskets for wear and replacing them if necessary.
3. Most leaky shower heads can be fixed by ensuring a tight connection using pipe tape and a wrench.
4. If your toilet is leaking, the cause is often an old, faulty toilet flapper. Over time, this inexpensive rubber part decays, or minerals build up on it. It’s usually best to replace the whole rubber flapper—a relatively easy, inexpensive do-it-yourself project that pays for itself in no time.
5. Another way to detect a toilet leak is to place a drop of food coloring in the toilet tank. If the color appears in the bowl within 10 minutes without flushing, you have a leak. Ensure you flush immediately after this experiment to avoid staining the tank.
6. Keep your home leak-free by repairing dripping faucets, toilet flappers, and shower heads. In most cases, fixture replacement parts do not require a major investment.