The simplest way to find out if you have hard water is a water test, but you also may notice signs throughout your home. Hard water actually leaves a deposit on everything it touches, so it may show up as a film on shower doors & glassware and crusty debris on faucets & shower heads. It can also clog up appliances like hot water heaters & dishwashers and make soap harder to dissolve causing you to use more soap products like shampoos & detergents.