Are synthetic pesticides and fertilizers prohibited in USDA certified organic farming?

By Bloom · 20 October 2026 · 3 min read

This page explains labels and certifications. Not medical advice; ask your paediatrician.

Understanding Organic Standards

Organic farming relies on natural substances and ecological management to support soil and plant life ^[4][2]. The USDA National Organic Program sets strict rules for what farmers can apply to their land ^[3][5]. To be certified organic, land must be free from prohibited substances for at least three years before a crop is harvested ^[4].

The National List acts as a guide for what is allowed ^[3][5]. While synthetic fertilizers are generally not permitted, some synthetic substances are allowed if they are specifically included on this list ^[1][6]. These substances must be approved by a certifying agent before use ^[3].

• Synthetic fertilizers are generally prohibited ^[4][6].
• Most synthetic pesticides are prohibited ^[2].
• Natural pesticides may be used ^[5][6].
• Specific synthetic substances are allowed if on the National List ^[1][3].

What the Organic Label Means

The USDA organic label indicates that a product was grown and processed according to these national standards ^[2]. It does not mean a product is entirely free of all pesticides, as certain natural or approved substances are permitted ^[2][6]. The label serves to verify that the farming practices followed specific rules regarding inputs and methods ^[5][2].

When you see the organic label, it confirms that the producer avoided prohibited synthetic chemicals and genetically modified organisms ^[2]. Because these standards focus on farming methods, they provide a framework for how crops are managed ^[4][6]. If you have questions about how these standards relate to your family, ask your paediatrician.

• No GMOs are allowed ^[2].
• Sewage sludge is prohibited ^[1][2].
• Natural substances are allowed unless specifically prohibited ^[1][3].
• Certifying agents must approve all substances used ^[3].

Comparing Products

When comparing two products, look for the USDA organic seal on the packaging ^[2]. You can also review the ingredient list to see if the product contains organic components ^[2]. Bloom verifies that products meet specific criteria, such as having a published ingredient list and no synthetic red flags, to help you make informed choices.

Remember that organic certification is specific to the production process ^[3][5]. Different products may carry various certifications, such as Non-GMO Project or Clean Label Project, which verify different aspects of a product ^[3][4]. Always check the label for the specific certifications that matter to you.

• Check for the USDA organic seal ^[2].
• Read the full ingredient list [Bloom].
• Look for additional third-party certifications ^[3][4].
• Verify the product has a clear, published ingredient list [Bloom].

What the Label Does Not Tell You

The USDA organic label does not mean a product is entirely free of all substances used for pest control ^[2]. While synthetic fertilizers and many synthetic pesticides are prohibited, the regulations allow for the use of certain natural substances and specific synthetic materials that appear on the National List ^[1][2][6].

Consumers should understand that the label indicates adherence to a specific set of production standards rather than the total absence of external inputs ^[2][6]. Some synthetic substances, such as chlorine or hydrogen peroxide, may be utilized in organic production if they meet strict criteria and do not contaminate the surrounding environment ^[6].

Evaluating Product Differences

When comparing two products, it is helpful to look for the USDA organic seal, which confirms the item was produced according to national standards ^[2]. These standards require that at least 95 percent of the ingredients in a processed product must be organic ^[2]. The remaining ingredients must come from the National List of allowed substances ^[3][2].

Beyond the label, producers may differ in their specific management practices, as the National Organic Program allows for various approved methods to maintain soil fertility and manage pests ^[4][2]. While all certified organic operations must follow the same core regulations, individual farms may choose different approved inputs, such as specific types of organic fertilizers like bone meal or rock phosphate ^[4].

Quick answers

Are all pesticides prohibited in organic farming?

No, organic farming does not mean the absence of all pesticides. Natural pesticides and certain synthetic substances on the National List are permitted ^[5][6].

What happens if a farm uses synthetic fertilizers?

If a farm uses prohibited synthetic fertilizers, the land must undergo a three-year transition period before any crops grown there can be labeled as organic ^[4].

On Bloom’s verified list

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How Bloom checks a product

Sources

1. Synthetic Substances in Crop Production | Agricultural Marketing Service ams.usda.gov
2. What Does USDA Organic Mean? What It Covers and Doesn't doudlahfarms.com
3. The National List | Agricultural Marketing Service ams.usda.gov
4. From Conventional to Organic Cropping: What to Expect During the Transition Years - Extension Store extension-store.montana.edu
5. Organic Farming | US EPA epa.gov
6. Does organic production use pesticides or synthetic fertilizers? | American Farm Bureau Foundation for Agriculture agfoundation.org

Bloom explains labels, ingredients and certifications. Not medical advice; ask your paediatrician.