Subslab Radon Suction with High Water Table

If you feel you are going to have that high of a water table, you should start with a sump pit or two. Sump pits can be incorporated into a radon system and ensure the water level stays below the slab. Currently, I doubt the water level is right below the slab as you would be having extreme moisture problems. When was the house built?

Bud

The details I have read about show the sump pits covered and sealed so the radon fan can pull a negative pressure below the slab. If the pit and system are installed at the same time they have lids specifically for that.

Was the plumbing for your radon system installed when the house was built?

Bud

It is the plumbing below the slab that needs to be in place. If the below slab space is not sealed from the basement you will just be pumping basement air out of the house. A radon system establishes a negative pressure below the slab, including the perimeter drains and captures the gasses before they can enter the living space.

Lots of information in the internet.

Bud

We must be thinking two different things. Radon mitigation is most often a sub-slab suction system and can be connected through a sump pit.
"One variation of subslab and drain tile suction is sump hole suction. Often, when a house with a basement has a sump pump to remove unwanted water, the sump can be capped so that it can continue to drain water and serve as the location for a radon suction pipe." From http://www.radon.com/pubs/consguid.html

That's just one, search "radon system design" for many more.

Bud