This is a very complicated subject and lead contamination in our environment is prevalent through the soil, water or air which can all transfer tiny trace amounts of lead to the growing plants. The FDA’s stance is that it’s not possible to remove or completely prevent lead from entering the food supply. The FDA, therefore, seeks to limit consumer exposure to lead in foods to the greatest extent feasible.
For more information please see fda.gov/Lead in Food, Foodwares, and Dietary Supplements