Filling void under slab from old water leak

Is foam an option?

How big is the hole? Post a picture.

All you can see is a 8” long (or horizontal ) to the slab by 4” hole or opening against the edge of the slab. I’ve run a stick into it and probed it. It’s at least 2 feet by 2 feet below grade.

It’s directly below where that leak from a tub and shower drain was previously leaking.

There was a drainage leak for about 13 years before we bought the house but we’ve had it 20 years. We had it fixed about 19 years ago. No apparent wetness at the bottom of the hole when I probed it.

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no but im currently dealing with a leak under my slab. following for suggestions.

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Fix the leak before you repair the slab.

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I’m hesitant to do mud jacking or any form of concrete since the sewer drain pipe is partially exposed in the hole.

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You want to be able to access the pipe or are you worried about the concrete cracking the pipe? Unless you develop another leak you shouldn't expect any movement of your foundation so I wouldn't worry about that.

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Fix the leak before you repair the slab

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Im still trying to pinpoint the leak. It's not from a pipe. Coming up through the vapor barrier, or whats left of it