Water tests are often conducted during home inspections and should happen at least once a year, but in some cases, you may want to do more. There are many problems you can look for in your water to know when it is time for your next test. If your water smells or tastes different, even if you are not sure, get your water tested. Testing your water is something that should be conducted even if you have your own well or if you get it from a large municipal area.