[LittleJoe]

Mt Lassen is close, but it isn't heating up.

[CROSSHIGHWAYMAN]

Mt Lassen is close, but it isn't heating up.

Pack up and be ready to go fast.

If the well water has heated up and it's not something gone wrong with the pump, magma must be on the move.

[Quix]

Uhhhhhh

Are you sure?

My understanding is that the whole inland volcanic valley/area has been heating up for several decades in spots, relatively slowly. I forget where I heard that--but it was about 30 years ago when I was doing some backpacking in the area.

[Axenolith]

Mt Lassen last erupted ~1917. How far away are you and what sort of increase in temp are you seeing? Additionally, it might help to check the pH, total dissolved solids and conductivity levels (among other parameters) over time. You can either rent or buy a meter for that, or the county guy might loan you one. Check it before the water enters any softening equipment you might have. The rate and amount of change could be relevant to it actually being something.

If it's really drastic, you could probably rope me into coming up and looking at it. If you're property is going to begin jetting steam, sulfur and magmatic ejecta I want to be there, because I'm a geologist and that would be COOL! ;)