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Fumigation Safety

Fumigation uses toxic gas to control pests in stored grain. This guide explains why the work is high risk and points to labels, EPA and trained professionals, without giving application steps.

What is fumigation?

Fumigation uses gas products to kill insects in stored grain or in a structure. The gas moves through grain and air spaces, which makes it effective, and also means it can escape and harm people if the work is not controlled.

This article does not explain how to fumigate. The label and trained professionals are the right sources.

Fumigation is often done by commercial applicators because of the risks and the paperwork involved. Even for experienced producers, the safe choice may be to hire a professional.

Why is it so hazardous?

Fumigants are toxic, and some can be harmful at very low levels. Some have no smell that gives a reliable warning. Bins can hold gas for a long time, and gas can escape through leaks, vents and equipment.

Exposure can occur during application, while the product is in the bin, during aeration and when the bin is opened. Each stage needs its own precautions.

Because the hazard is not obvious, people can be harmed without ever realizing a gas is present. This is why trained, equipped professionals work with monitoring instruments rather than their senses.

• Toxic to people and animals
• May leak from the bin
• Hazards during application, holding and aeration
• Not reliably detected by smell

Who is allowed to fumigate?

Fumigants are often restricted products, which means certification, training and detailed plans may be required. Requirements differ by product, label and state.

Check with your state department of agriculture and EPA's pesticide pages. If you are not certified and trained, hire a licensed professional.

A licensed applicator should be willing to show their credentials and explain the plan. Check with your state agency if you are unsure how to verify a license.

• Check certification with your state agency
• Ask for credentials from any applicator
• Keep the plan and label on site

What does a safe plan include?

Official sources describe written plans, notice to neighbors and others, warning signs, monitoring with proper instruments, trained people, and protective equipment as set by the label. Labels may call for a second trained person to be present.

Do not copy or guess these items. Get them from the label, the manufacturer and your state agency.

After treatment, the gas must be cleared in a controlled way before anyone enters or the grain is moved. The label describes this stage, and a trained person should confirm it is safe.

How do I protect people nearby?

Keep family members, workers, visitors and animals well away from the treated area and any structure connected to it, as the label directs. Post warning signs as required. Do not allow children near the site.

Make sure homes and other buildings nearby are considered in the plan, since gas can drift.

Think about pets, livestock and neighbors. Tell neighbors as the plan requires, and keep animals away from the site.

What should I do if someone is exposed?

Call 911 right away if someone becomes ill, faints or has trouble breathing near a fumigation. Do not go into the area without proper breathing equipment and training. Tell the dispatcher that a fumigant is involved and give the product name from the label.

Poison control services can also provide advice. Check official resources for the correct contact.

Keep the product label, the written plan and emergency contacts at hand throughout the process, and make sure someone besides the applicator knows where they are.

• Call 911 for any serious symptoms
• Name the product when calling
• Do not enter without proper equipment

Where can I learn more?

EPA's pesticide pages, your state agriculture department and extension offices publish fumigation guidance and training. Product labels and safety data sheets are essential reading. OSHA and NIOSH give guidance on chemical safety.

This site does not recommend commercial products or providers. Ask your extension office for ways to find qualified applicators.

Local fire departments may want to know when fumigation is taking place on your property. Ask your applicator and your state agency whether notice is required.

Last reviewed: November 12, 2026. Written by the Farm Safety Editorial Team. See our editorial policy.