Aloha,How you respond at this point really depends on the source of contamination...was this a clean water (Class 1) issue, "Grey" water (Class 2), or "black" water (Class 3) that can cause serious illness?

Unless if it’s like contamination or something.

It's like buying a home and the electric water pump and etc... were taken out and sold.If the well has enough water you can water your lawn, or a herd of horses with it...Some of those old wells are only drawing from near surface water and may have contaminants if you drink or bath in it-- it might not even be drinkable safely by animals.If it was drawing from an aquifer down deep with good drinking water that would be best.In your area the bored well may be appurtenance, and the pump and windmill gear may be too, or the mechanicals may be personal property (???) 

We have to reuse the same one and put a surgical mask over it to keep it from getting contaminated.

We have serious air pollution problems from wildfires, atmospheric inversions, and now the drying Great Salt Lake--which has a salt bed contaminated with lead, arsenic, and numerous other pollutants that get carried into the air by our frequent wind storms. 

If I am selling a house that used to be a meth lab, if I disclose it was a meth lab and have the buyer sign a hold harmless would that take off the liability of future lawsuits? I know I need to consult an attorney bu...

It's not worth spending the money on those 2 studies, then possibly having to fix a soil contamination problem. 

Also, anyone have any experience with site contamination clean up?

Interesting read thanks for the post @Carlos Rodrigues.My guess is the seller knows there is an issue with the tank/soil contamination otherwise it would still be for sale or could just be a stubborn person.

jasmine.Provide some more specific details on the leak source or the extent of damage and you will get a more direct answer.The process of remediating mold contaminated construction materials can run from $500 to $50,000.Travis West