If you are worried about E-Coli and bacteria on food's surface, you should be more concerned about how personal hygene (and who) handled (and picked) the foodstuff and under what conditions it was shipped and stored and how you handle it at home.

From a Canadian food inspection website: ""Extensive testing by university and government food scientists has shown no difference in nutritional quality or safety between organic produce and that grown by traditional methods. Regardless of the production method, all food must meet the same inspection and food safety standards"".