Your local health department should have some useful information online. You could also contact your local health department if you had any pressing questions or worries. Two other good sources of information about national surface water and local water wells are the Environmental Protection Agency (EPA) website and the National Ground Water Association website. Your local certified well contractor or a similar expert can also offer safety tips and advice to homeowners, especially if you think you need to replace an existing well or you have a reason for serious concern, and these professionals will know the water source in the areas near your home really well, too.