Anyway of detecting an underground plumbing or sewer leak?

Originally Posted By: Diana Reese
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Hey – I know it’s possible to turn off our water and check to see if the meter keeps going, but are there any tell-tale signs that we could have a sewer leak? We have a narrow crack in our garage slab very near the entrance and it looks like something has oozed up through the crack and left a whitish discoloration and stain. It’s fairly large, but it doesn’t appear to be repeating itself.


Could this be water that was trapped under the slab, like spalling? And where would this have come from?

We also have a toilet that periodically does not flush so well.

Any opinions would be very welcomed. Thank you! ![icon_biggrin.gif](upload://iKNGSw3qcRIEmXySa8gItY6Gczg.gif)