Nuclear Fallout Preparedness Checklist: Essential Supplies and Shelter Steps

A practical emergency kit can help a household shelter indoors if officials warn of radioactive fallout after a nuclear incident. Start with sealed water and food, a battery-powered or hand-crank radio, essential medicines, flashlights and supplies for cleaning exposed skin. Many of these items also help during storms and ordinary power outages.

This checklist is general preparedness guidance, not a prediction that a nuclear attack will occur. In an actual radiation emergency, follow local emergency officials. The CDC’s basic guidance is to get inside a substantial building, stay inside and stay tuned for further instructions.

Before you start: supplies and planning

• Who it helps: individuals and households planning for a period indoors, including families with children or pets.
• Time: about 30–60 minutes to inventory existing supplies; gather missing items over time.
• Difficulty: easy; medical and accessibility plans may require advice from a healthcare professional.
• Basic equipment: a storage container, paper checklist, flashlight, radio, batteries, sealed food and water.
• Goal: place supplies where they are accessible from a suitable indoor shelter and maintain enough for several days where practical.

Begin with what you already have. Adjust quantities for household size, infants, older adults, disabilities, pets and specific medical needs. A kit is useful, but it is not a substitute for prompt shelter or official instructions.

How to build a nuclear-fallout preparedness kit

Step 1: Identify a suitable indoor shelter

Plan in advance where you could get inside quickly near home, work or other places you spend time. The CDC advises moving to the middle of a building or a basement, away from doors and windows, during a radiation emergency. A substantial building generally offers better protection than remaining outdoors or in a vehicle.

Keep your household kit in an accessible indoor location. Do not delay getting inside to collect supplies from outside. The CDC’s radiation-emergency guidance summarizes the three priorities: get inside, stay inside and stay tuned.

Step 2: Store sealed water and shelf-stable food

Include bottled water and foods in sealed containers that your household can eat without complex preparation. Add a manual can opener, utensils and any infant formula or feeding supplies needed. Plan for dietary restrictions and rotate supplies before their expiration dates.

During a radiation emergency, the CDC recommends bottled water and sealed food. Food or drinks that were outside and uncovered may be contaminated. Check public-health instructions before using a water supply that officials say may be unsafe. Wipe the outside of containers before opening them if contamination is suspected, following official advice.

Step 3: Prepare light, power and reliable information

Keep a flashlight with spare compatible batteries and a battery-powered or hand-crank radio. A radio can help you receive official information if phone or internet service is disrupted, although reception depends on functioning local broadcasts. Check equipment periodically and learn how to find local emergency stations.

Charge phones and backup power banks when practical, and keep charging cables where you can find them. Store paper copies of emergency contacts and a simple family communication plan. For an ordinary outage, FEMA recommends battery-powered lights and safe generator use; a generator must never be operated indoors or in a garage.

Step 4: Plan for medicines, first aid and accessibility

Include a basic first-aid kit, regular medications where possible, glasses, hearing-aid supplies and copies of important medical information. Check expiration dates and storage requirements. If someone depends on electricity for medical equipment or uses refrigerated medicine, ask their healthcare provider and equipment supplier for a power-outage plan.

Consider mobility, communication or sensory needs when selecting a shelter location and storage container. Arrange in advance how family members, caregivers and neighbors can contact one another without depending on a single device or network.

Step 5: Add cleaning, clothing and pet supplies

Keep soap, clean clothing, towels or damp wipes, plastic bags and household hygiene items. If you were outside during a radiation emergency, radioactive material may be on clothing or exposed skin. Once safely inside, follow official instructions to remove the outer layer, place it in a bag away from people and pets, and wash exposed skin or shower if possible.

FEMA’s nuclear-detonation response guidance discusses changing clothes and showering or using damp wipes. Avoid scrubbing the skin, and follow local guidance if running water or other supplies are limited.

Bring pets indoors when safe and keep pet food, water, any medication and cleaning supplies available. If an animal was outside, follow official advice for removing possible contamination. Do not leave shelter solely to retrieve an item when officials say it is unsafe.

Step 6: Review the plan and official instructions

Tell household members where the kit is kept and how to reach the planned shelter area. Practice using the radio and flashlight, check supplies twice a year or on a schedule you can remember, and update paper contact information. Make plans for household members who may be at school, work or another location when an emergency happens.

The CDC says staying inside for at least 24 hours can protect people during a radiation emergency, unless officials provide other instructions or a life-threatening situation requires urgent action. Listen for guidance on shelter, evacuation, water safety and medical help; 24 hours is not an automatic all-clear, and the time needed can vary.

Should potassium iodide be in the kit?

Potassium iodide, or KI, can protect the thyroid from radioactive iodine in specific circumstances. It does not protect the whole body from radiation or from all radioactive materials, and it is not a substitute for shelter. The CDC advises taking KI only when directed by public-health or emergency officials or a healthcare provider.

For fallout following a nuclear detonation, the CDC says KI will not protect against the main radiation danger and should not be treated as a protective measure against fallout. Taking KI when it is not appropriate can cause harm. Do not substitute ordinary table salt or iodine supplements, and do not leave shelter merely to look for KI. Discuss individual medical questions with a healthcare professional before an emergency.

Troubleshooting common problems

The radio will not turn on

Check battery orientation and expiration, try fresh compatible batteries and test the hand-crank mechanism according to the manufacturer’s directions. If the radio works but cannot receive a station, reception or the transmitter may be unavailable; use another safe information source if possible.

There is no running water for washing

Once safely inside, remove the outer layer of clothing and use damp wipes or a damp cloth on exposed skin if a shower is unavailable, following official guidance. Put potentially contaminated clothing in a bag away from people and pets. Continue listening for instructions.

A family member needs powered medical equipment

Use the backup plan developed with their clinician and equipment provider. If the situation becomes life-threatening, seek emergency medical help and follow the guidance of emergency responders. Do not rely on an untested power source or bring a generator indoors.

Frequently asked questions

Is this checklist a warning that a nuclear attack is expected?

No. It is general preparedness information for a hypothetical emergency and also contains supplies useful during other disruptions.

How long should I stay inside?

The CDC advises that staying inside for at least 24 hours can protect you during a radiation emergency. Follow official instructions, which may direct a different action, and seek urgent help for a life-threatening situation.

Will potassium iodide protect me from all radiation?

No. KI addresses radioactive iodine in the thyroid only. Take it solely when directed by officials or a healthcare provider, and use shelter as instructed.