If you have such things where you live, many swimming pool supply shops will also do analysis for you. I'm also on a well, but have never had the analysis done. The only advantage to knowing it that I can think of is if you're trying to duplicate exactly a particular regional style. In that case, you're probably better off starting with RO water and adding the appropriate mineral, etc.
Quite honestly, if you like your well water, I wouldn't change it. Let it be part of what makes your beer, your beer.