As a private well owner or well-water consumer, you will probably use groundwater from your well for doing your family's laundry, drinking, cooking, bathing and watering your garden.
Municipalities are required to test their water supplies regularly to ensure the water is safe to drink. However, since there is no requirement to test a private well, except when it is first drilled or the pump is changed, you are responsible for making sure your water is safe.
While most private wells provide a clean, safe supply of water, contaminants can pollute private wells. Because you cannot see, smell or taste most contaminants, you should test your water on a regular basis. The types of land uses near your well determine which tests you need to have performed on your water supply.