[No coverage for] Water below the surface of the ground including that which exerts pressure on or flows, seeps orleaks through sidewalks, driveways, foundations, walls, basement or other floors, or though doors,windows, or any other opening in such sidewalks, driveways, foundations, walls or floors;...Wear and tear; marring; deterioration; inherent vice; latent defect; mechanical breakdown; rust; mold;wet or dry rot; contamination; smog; smoke from agricultural smudging or industrial operations; settling,cracking, shrinking, bulging, or expansion of pavements, patios, foundations, walls, floors, roofs orceilings; birds, vermin, rodents, insects or domestic animals.

I would certainly make sure you did environmental due diligence including having the sellers sign an environmental questionnaire indicating whether they know of any environmental concerns.I have seen environmental contamination from gas stations go under major interstates and impact properties several hundred feet away.

and many times you will find your waste line is contaminated and needs to be snake ( easiest if able) or is beyond useful life and needs to be replaced

The couple sued (and lost), thinking the words in the paperwork had meant a non-contaminated well.

@Brandon Ellis That's going to depend on the extent of the contamination.  

Contamination issues are the legal responsibility of the current property owner regardless of who caused them.

Contaminated land.

I'll guarantee you that it's contaminated.

I can't imagine you'd want to take it as-is with the tank, because if you try to remove it after buying and find the soil is contaminated, and possibly contaminated the ground water, you could be looking at a bank-breaker of a job.  

For example, if the sewer system backs up are you going to tear out contaminated materials or will you want to try to clean them and "save money" (not recommended).