Each year, The Environmental Working Group compiles these lists based on testing data from the USDA and the FDA. The USDA peels or scrubs and washes produce samples before testing, whereas the FDA only removes dirt before testing its samples. Even after these steps, the tests still find traces 251 different pesticides**. Fruits and Vegetables are staples of a healthy diet, so for those looking to decrease their pesticide exposure, these lists are a great guide when grocery shopping.