There is nothing bad about drinking hard water. Hard water is water that contains minerals, usually calcium and magnesium, which are good for you. As for your home, that’s another story. Hard water causes limescale to build up in your pipes and water appliances, which reduces their efficiency. It leaves a film on bathtubs and shower tiles, and that same film is left on your hair causing it to be dull and on your skin causing it to be dry. It can also leave water spots on your dishes and clothes washed in hard water tend to feel hard and look dingy.