I've done enough lab work that I can confidently say this: Your groundwater is not clean. It might be safe enough though. But you have a much higher risk of contamination through natural and artificial pollutants and natural fluoride levels should (hopefully) have been checked to prevent enamel damage from overexposure. Good, clean, pure water would come (in my recommendations) from a reverse osmosis filtration system, UV treatment, and chloramines (or Ozone if you can keep a residual with it) to provide a residual in the pipeline. The costs go down as the project scales up and more natural redundancies take over because of the need for maintenance applications.