If you collect the rainwater ...

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If you collect the rainwater correctly and use for grade tanks the water stored in the tank should be of potable quality. Ceramic water filters can be used to further filter the water http://www.safewaternow.org/?page_id=31

To learn more about rainwater harvesting go to the American Rainwater Catchment Systems Association http://arcsa.org. They have a manual that can be used for reference. The Australians Rain Harvesting http://rainharvesting.com.au have great products for small to medium sized systems. The Germans have several companies Wisy, 3P Technik and Intewa. 

I have tested 4 of my systems and they are potable according to Georgia State residential requirements. 

Let me know if you have any questions just follow the ARCSA guidelines.