If you click on one of my recommended item links and then place an order through Amazon, I receive a small commission on that sale, at no extra expense to you.

12 Most Contaminated

You should always buy these organic, if possible, because their conventionally grown counterparts tend to have pesticides. They cost about 50 percent more — but are worth the money.

• Peaches
• Apples
• Sweet Bell Peppers
• Celery
• Nectarines
• Strawberries
• Cherries
• Pears
• Grapes (Imported)
• Spinach
• Lettuce
• Potatoes

12 Least Contaminated

No need to go organic with these foods.

• Onions
• Avocado
• Sweet Corn (Frozen)
• Pineapples
• Mango
• Asparagus
• Sweet Peas (Frozen)
• Kiwi Fruit
• Bananas
• Cabbage
• Broccoli
• Papaya

Source: Environmental Working Group