Need some advice. We are thinking of purchasing a multiacreage property in Texas - however the previous owner has leased the water rights to a LP company for 15 years. Questions: A) is it advisable to buy such a prope...

I suspect in many cases the repair would be to the EXTERIOR of the home in working to change the ground water conditions.

Our insurance company denied the claim saying it was ground water damage.

During the thaw, we discovered a major ground water leak in the basement bedroom.

If you're talking ground water heat pump, they are more efficient than air to air, but the installation costs are way higher than nat gas.I've been installing 92% efficient nat gas furnaces with PVC side wall vent, no need for a chimney and you can locate the furnace most anywhere in the building.

And there are 3 choices generally:  1 you dig it up and take it elsewhere where you are still liable for it, 2  you build an incinerator on site and dig it up and burn it and dispose of the ashes somewhere where you always have liability for it or 3  you leave in there and put a cap over it and never disturb the cap, replace the cap when it degrades, and hope and pray the groundwater table does not move the pollutants off onto someone else's property where you will then be responsible for them.I did site assessments for the federal EPA in my regular job many years ago. 

Typically you can only depreciate improvements like drip irrigation, pivot irrigators, wells and pumps, the groundwater supply itself, buildings, etc.My background: we syndicate, operate, and own outright large winegrape vineyards in Texas.

The age of the house, the location/market, expansive soils, ground water levels, and many other things can affect the answer. 

Honestly there isnt much the builder can do to get rid of ground water . 

I've been an environmental lawyer for over 35 years and have encountered only one home tank that exceeded $100K and that was an extraordinary situation where there was pressurized piping with a diesel tank and where the consultant committed fraud by over-excavating the site. most home heating oil tanks will range from $10K to $20K with costs approaching $50K-100K where groundwater is impacted and used for drinking purposes.