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REASON OF IDEA
        Although the tell tale signs of hard water are obvious, it takes a little homework to find out just how hard your water really is. If  you’re served by a municipal water company’ call the city office or the Superintendent of  Water and ask for the test results.

If they quote the quantities of various minerals in part per million (ppm). You can easily work out the conversion of ppm to gallons per million (g p g) by dividing the quantity of ppm  by 17.1.
        If  your water is supplied privately, you’ll probably have to test for hardness. In some areas, city or county health departments  offer testing. If  yours doesn’t you can have it tested by an independent water-testing lab or a water conditioning company, but be advised that the latter has a stake in the outcome and offer testing as a come on for selling you equipment you may not need. Many softener companies will hard water test a mailed-in sample for free; some will send  you a do-it-yourself test strip kit. If you have a well, it is very important to test your water—not just for hardness but for safety.

Though the need varies depending upon the source, check it at least once for mineral content, lead and radon (where radon is a threat ) and once  or twice a year for bacteria and nitrate. If  you have concerns about contaminants in well water, contact your local health department for recommendations.