From what I’ve read, the water that comes back up is extremely caustic and damages the plumbing and machinery.
??? From what I know the piping goes under hot ground and water or gas is pumped under ground and heated and it goes through a loop. I had thought it was water but supposedly a certain gas works better. The ground temps can be in excess of 200 deg F.
The only issue I coul dsee if underground piping could be damaged due to tremors. This grounds is usually hot due to underground activity.