This question is best ...
Published by Jean Arenas, Sales and Marketing Professional with Water, Signage and Telecom Experience
This question is best answered with a fairly good paper that addresses the issue from its many sides and approaches. - http://groundwaternitrate.ucdavis.edu/files/139107.pdf
A careful consideration of these options will guide you to your particular best case scenario since each well should be considered as a unique case.