It wouldn’t hurt to proceed cautiously. California is full of earthquake faults (full of faults in general), and we don’t fully understand them. My wife worked for PG&E, often had to go to geysers where they produced electricity from geothermal vents. (PG&E forced by politics to give it over to another company since then). I don’t know where that water comes from, but it’s a possibility it comes from very deep down in the earth. She also sometimes visited Diablo Canyon nuclear plant, which is near faults. Both involve use of water. Also, water is used in fracking. Water is a precious resource in short supply here.
I doubt Water used in Fracking is loaded with germs....