How to Check Your Home for Hidden Plumbing Leaks

Start with the places you can see

Listen for faucet drips and running toilets. Look under sinks for wet pipe connections or water spots. Check accessible appliance connections for moisture, without moving heavy equipment or dismantling anything.

Compare meter readings when no water is being used

If your meter is safely accessible, EPA suggests comparing its reading before and after a two-hour period without using water. Automatic equipment, irrigation and appliances must not draw water during the check. A change suggests a leak or another unaccounted-for use; it does not locate the source.

Check a toilet that seems to run

EPA describes a simple dye test: add food coloring to the tank and check the bowl after ten minutes without flushing. Color appearing in the bowl indicates a leak. Flush afterward to avoid staining. Follow your fixture instructions if they specify a different approach.

Write down what you find

• Fixture or room where water or sound is noticeable.
• Whether the concern is continuous or happens only during use.
• Meter readings and the time between them, if checked.
• Any unexplained change in water use or prior repairs.

When to bring in a plumber

Ask a plumber to investigate when water use remains unexplained or visible leakage continues. Avoid opening walls or tightening unfamiliar connections to hunt for the source.

Give the plumber your observations and ask which tests they recommend. Request a written explanation of the repair scope before approving the work.

Turn a one-time check into a routine

Pick a regular reminder to listen for drips and look under sinks. Keep repair notes in one place, especially for a recurring issue. Your next check will be more useful when you know what was repaired and when.