Whether you draw from a private well or the local municipal supply, there's a chance that you've got hard water—that is, water with high mineral content. It may not be harmful to your health, but it surely could spell trouble for your plumbing. Ignorance isn't bliss, at least not in this case. To avoid future problems, test your water to see whether it contains potentially problematic concentrations of calcium and/or magnesium. If so, you can install a water softener.