[zdragnar]

What is the water storage tank for? We've never needed one, and the only time I've heard of someone getting one was for trapping rainwater or they were a farmer.

I've lived with well water for all of my life except my college years and a few years after. In all that time, the only maintenance that's been needed has been to replace a water pressure tank (not a difficult job unless you've never seen hand tools before) and adding salt to the softener once a blue moon.

My sister in law had to get a new well put in, but that was because it needed a new well pump and the plumber she called told her he couldn't work on the existing one because it was out of code and her well wasn't grandfathered in.

[nradov]

The storage tank was for storing water. Obviously you don't want to run the well pump every time you flush the toilet.

[zdragnar]

Sure, that's what the pressure tank is for. The well pump keeps the 20 gallon tank pressurized, and as the pressure drops the pump kicks on until it is stable again.

Maybe you could get a bigger one if you have a large family, but I've never heard of one that would be large enough to dump that much water except for mountainside cabins that are too far from the water table for a well in the first place.