best_practice_faq 163

Pinhole and other leaks may not be easily identifiable. Start by walking through spaces that have water-using equipment (restrooms, irrigated landscaped, custodial closets, kitchen, etc), and remember to visit even rarely used spaces. If the building has submeters, reviewing the data in detail can point to which system or building area has the leak. You can also use specialized equipment (or hire a service provider) to use ultrasound and infrared thermography to identify the location of the leak.

It seems we have a leak, but we cannot determine the cause. What are some options for investigating mysterious leaks?
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