Slow leak somewhere resulting in high water bills

Hey great question! Those mysterious leaks causing high water bills are always a pain... Typically when a customer hires us for a similar problem we always start by doing a pressure test on the house. We hook up a pressure gauge somewhere on the system (preferably near the water meter) and then shut off the main valve. We monitor to see if we notice any pressure drop in the system. If we notice a pressure drop then we can confirm that the leak is indeed on the house side and not on the municipal side of the water meter. Second step we check all the fixtures in the house for slow drips, we check all the exterior taps for leaks, we us a moisture detector to see if there is any active piping leak. Lastly we perform a dye test on all the toilet tanks to see if any water is leaking from the tank into the toilet bowl. Often enough we find toilets to have a very slow internal leak that can go unnoticed and cause those spikes on your water bill!