[LittleJoe]

Many active faults. No smell, water still tastes the same. Just can't get a cold drink anymore!

[mewzilla]

Any way to tell if the water level in your well has changed substantially?

[Shermy]

Story of Paricutin volcano in Mexico

[kingu]

Err, I forgot to ask - is the temp from the tap or from a sample taken out of the well itself? Have you checked to see if the well pump is starting to break down?

[RinaseaofDs]

The other thing you need to be concerned about is the presence of poisonous or oxygen displacing gases.

Radon is something you should have your home inspected for, and also keep in mind that heavier-than-air gases may sometimes be a by-product of geothermal or seismic activity.

Whole villages have been killed by eruptions of poison gases originating from mountain lakes in Africa. The gases are heavier than air, and hug the ground as they travel, displacing oxygen in front of it.

I'd hire an inspector to come out and sample the water and the air. I'd have a plan for getting people into another living situation if you find out you have Radon or something else.

[BobS]

You should buy a pH testing kit and see if it is turning acidic. SO^2 and SO^3 mixed with water become sulfurous acid and sulfuric acid.