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Seems like these 'shallow', thin lithosphere locations, close to the magma, would be the 1st-choice locations.
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Your search term: '[*your_state} hot springs'
I like the concept of the water-to-water-to-air heat exchanger. A tank at the bottom of a well with two pipes down to it, and a DNA spiral inside the tank. The 'dirty' water never goes anywhere.
For economical reasoning purposes, lower tank is 6-8" PVC tens of feet long, with a loose copper spiral.