Our well water is hard enough to walk on, but the most difficult problem to deal with has been the fact that the content and pH of the water changes with seasons - the water table changes level with the dry summer, or rises during a wet spring, causing the water to flow through different layers in the ground. Depending on where the water table is, the content of the water changes - sometimes very alkaline, sometimes not so, sometimes high in iron and sulfer, and sometimes not.
If you use well water, it is a very very good idea to test your water fairly frequently so you know where the pH and such is at the moment. At least test it every season.