How can you tell where a water leak is coming from?

How you can tell where a water leak is coming from involves systematic inspection of common leak sources and using detection methods to pinpoint origin of water. First, look for visible clues, check ceiling stains, wall discoloration, bubbling paint, or damp spots, water typically travels down, so stain may be below actual leak. Second, check plumbing fixtures, inspect under sinks, around toilets, water heater, dishwasher, washing machine, and refrigerator ice maker for pooling water, drips, or corrosion. Third, test toilet for leak by adding food coloring to tank, if color appears in bowl without flushing, flapper leaks. Fourth, check water meter by turning off all water in house, then monitor meter for 30 minutes, if it moves, you have hidden leak. Fifth, listen for sounds of dripping or hissing in walls when water not in use, indicating pipe leak. Sixth, feel for warm spots on floor which may indicate hot water slab leak. Seventh, inspect outside, look for soggy yard, foundation cracks, or water pooling near house during dry weather, indicating underground pipe leak or poor drainage. Eighth, use moisture meter or infrared camera, which professionals use to detect hidden moisture behind walls without demolition. Ninth, check roof and gutters for leaks during rain that may appear as water inside. If you cannot locate source, call plumber with leak detection equipment that uses acoustic listening devices and thermal imaging to find hidden leaks accurately.