How to Determine if You Have a Water Leak.

The best method of determining whether or not a leak exists is to take an actual water meter reading. This method checks the internal plumbing system for water leaks. Take a water meter reading just before going to bed, or when no one will use any water for several hours. Take another meter reading in the morning before any water is used, or after a few hours of non-usage. In theory, the two readings should be the same. If they are not, and you cannot account for use by a humidifier, ice cube maker, toilet flush, or water softener, you have a leak and further investigation is recommended.

Follow these easy steps to investigate if you may have an "invisible leak."

Now that you have done a meter reading and you suspect a water leak somewhere in your system that you can’t see:
  1. Begin by checking all your faucets for visible leaks, then
  2. Check the toilets for leaks by adding food coloring to the water in the tank. Do not flush.
  3. Wait for 15 minutes to see if the colored water appears in the toilet bowl. If it does, there is a leak. Repairing toilet leaks is normally inexpensive and easy to do. Replacement part kits are available at most hardware stores.
  4. If there appears to be no leaks inside your home, and the meter is located outside, check for underground leaks. Turn off your main valve inside then turn on a faucet to verify the valve is working--the water flow should stop completely.
  5. Go back outside to the meter to see if it continues to run with the main valve off. If it does, there is a leak somewhere in your plumbing between the meter and the valve.
  6. After making repairs, repeat the meter reading procedure to verify that there are no more leaks.