The purpose of the research project was to discover whether or not my home tap water is hard water. More than one method for finding this out was used. One method, the conventional and more straightforward method, is to simply test the hardness of the water using a store-bought testing system. This method was be accurate and easy, indicating that the tap water is moderately hard. The second method is also accurate, but it does not give numerical data. Soap bubbles precipitate out of solution and form a soap "curd" in hard water. In contrast to the first method, the data is obtained visually by looking at the amount of bubbles in each jar of water; three jars were used: hard water, soft water, and tap water. The results of both experiments were correct and helpful. While the first test uses precise measurements of grains per gallon, the second test is accurate in its own sense. My conclusions from the tests are exact and reliable. In two different manners each test said essentially the same thing. My home water is indeed moderately hard (3 to 7 gpg). The effects of my hard water have been seen in many aspects of my home (dishes, pots, toilets etc.). The hard water in my home should be dealt with and eliminated, for it creates many expensive hindrances. The applications of this hard water experiment are certainly more than a few. Hard water is such a common problem that all homes should test for it. It can be at least limited, and if not, completely done away with. There are numerous hard water softeners and other methods that are successful in reducing and/or terminating the ugly, annoying and expensive problem of hard water.