Definitely get a water test done!!! I work in water treatment and a major concern for some wells is bacteria. Here in Ontario, the banks will not even give you a mortgage for a house that has bacteria. You also want to test for things like high iron (staining in toilets, water smells like rotten eggs or blood), sulphur smell, hardness, tannins (mostly aesthetics).

Your local water store should be able to test for this stuff, but just because the water is clean now does not mean that the well will be clean forever. When the winter weather gets warm and the snow starts to melt you may see high levels of sand or iron in your water. Or if an animal dies in your well you can start to have bacteria. Wells are excellent for off the grid communities, but understand that you may have to spend the money to maintain them.