Here is a list of several things you can check if you suspect that you have a water leak. Always start checking with your toilets. Toilets cause most of the leaks in your home. If your toilet runs on after you flush it, you should get it repaired immediately. Every time your toilet runs it is like leaving on the faucet and letting the water run down the drain.
Toilets can also have silent leaks.
To determine if your toilet does, put food coloring in the tank at the back of the toilet. If the color shows up in the bowl without you flushing, it means that the water is leaking around the bottom flap in the tank. Instead of using food coloring, we have dye strips that you can pick up at our office. Both of these problems are cheap to repair if you fix them yourself and will save you money on your water bill. If your toilets are not the problem, you should check around your home for dripping faucets, pipes and leaks around your hot water tank.