Multiple ways can be implemented to find the hidden leak pipe(s). First of all, check for hidden leaks with the use of your water meter. Then, turn off all the water connections and record the number on your meter. Wait at least for half an hour and recheck your meter. If the meter reading has changed, then you have to fix the issue because there is water leakage. To detect that particular leaking pipe, check the tank parts of your washrooms, especially the flapper valve. Also, check under the kitchen sinks and look for drips from your showers or taps. If you are unable to do that, contact us. We can help you in finding the hidden leak pipes or areas.