Hard water causes stain and scale build-up on fixtures ad can make washing dishes and cleaning windows difficult. What’s worse, if this water goes untreated, scale can build-up inside the plumbing system. The best way to determine whether or not a property has hard water is to check the exteriors of the plumbing lines for signs of build-up. If you find any, try to negotiate a water softening supply into the deal. Ask your 24 hours plumber about this to help wiggle this add-on to your package.