TL;DR: If officials order evacuation in a chemical release, leave the danger area for a shelter outside it and stay away until police, fire or other local officials give the all clear.
Households should prepare now to leave fast when a hazardous release makes staying inside unsafe. According to What to Do to Evacuate in a Chemical Emergency | Chemical Emergencies | CDC, a page dated June 10, 2026, "evacuate" means to get away from danger because the building or area is not safe to remain in during the event. Residents go to a shelter or another location beyond the affected zone and remain there until the situation is under control. That stay can last a few hours, possibly a few days, or longer.
That guidance frames evacuation as one of two protective choices. The CDC explains in About Chemical Emergencies that a chemical emergency happens when a hazardous chemical is released and the release could harm people's health. The causes described include an accident, such as a train derailment, or a deliberate release such as a terrorist attack. The recommended protective sequence is to get away from the area, get it off and get clean, and get help, while listening to authorities about whether leaving or sealing off an indoor space is safer.
When leaving is safer than staying inside
Some releases make sealing a room and remaining in place dangerous. The evacuation guidance identifies a train derailment or terrorist attack as examples where sheltering in place could be unsafe and departure may protect health.
Families should not try to decide alone which option applies. The CDC directs residents to monitor the radio, television, mobile alerts, or a mobile news app for current instructions, and to follow directions from police, fire, or other local officials. Those officials identify local shelters and provide travel directions during the incident.
For household planning, the practical lesson is to treat both options as possible. A home can be prepared to seal one room, and at the same time be ready to lock up and drive or walk to an assigned shelter if authorities say the plume, spill, or airborne material makes the neighborhood unsafe.
How to stay informed during the order
Information discipline matters because routes, shelter assignments, and safety boundaries can change quickly.
- Listen to radio, television, mobile alerts, or a mobile news app for updates.
- Watch for text alerts about when to leave and where to go.
- Follow instructions from police, fire, or other local officials.
- Check a phone for messages about the nearest shelter when away from home.
Local cell networks may not be working normally, so the CDC advises having backup ways to pass word, including calls or texts to a contact outside the area and messages through texts or social media if family members are apart.
The six-part household evacuation plan
The CDC sets out six actions for a home evacuation plan, and practicing them is part of the plan itself.
1. Map exits and destinations
Plan how the household would leave and where it would go to get clear of the release. Consider several different routes in case one is blocked. Think through day and night conditions, school and work locations, and what to do if the usual road is closed by responders.
2. Assign authority to official directions
Follow the instructions of police, fire, or other local officials. They name shelters and give directions. Do not freelance a destination inside the hazard area or return for forgotten items against orders.
3. Solve pet placement in advance
Find a place that will take pets but also have a backup arrangement to leave a pet with someone else if needed. That dual-track approach matters because some emergency shelters accept only service animals.
4. Set a communications plan for separation
Make an emergency plan to stay in contact if household members are separated. The CDC notes that texts or social media messages may be needed to relay information when voice calls fail or people are sheltered in different places.
5. Rehearse the plan
Practice so everyone knows what to do. Walk through loading the car, securing the house, accounting for children, and confirming the out-of-area contact. Include neighbors or caregivers who might help with transport or animals.
6. Build Go Kits for people and animals
Make Go Kits for the family, including any pets. The guidance suggests considering two bags — one for home and one for a car, truck, or other vehicle — so supplies are available whether the order comes while everyone is home or while someone is on the road.
What to pack in Go Kits
A Go Kit holds basic supplies and important papers that may be needed while away. According to the evacuation guidance, examples include personal needs such as nonperishable food and water, prescription and non-prescription medications, power sources such as batteries and flashlights, and important paperwork.
The stated water planning figure is at least one gallon per person or pet per day. That amount helps a household size containers and vehicle storage realistically rather than guessing at checkout-line bottles.
Pet kits need the same deliberate packing. The CDC advises gathering materials a pet would need, including food, medications, important papers, and other supplies, and points readers to Pets: Preparing for a Chemical Emergency for detail. That companion page, also dated June 10, 2026, lists examples such as enough food and water to last two weeks, food and water bowls, litter and waste bags for cats, waste bags and cage liners for dogs, large and small trash bags, disposable gloves, a two-week supply of medicines, a pet first aid kit, and an extra collar, leashes, and harness. It also urges owners to line up pet-friendly hotels or ask friends or relatives whether the family and animal could stay with them.
If the order comes while you are home
When told to go to a shelter, follow the directions to that shelter. If the household has its own vehicle, check with neighbors to see if they need a ride.
Before locking the door, call or text a friend or relative outside the area to report the destination and confirm safety. Leave a note in the home saying where the household has gone. Both steps help responders and relatives account for residents if networks are strained.
What to wear
Wear clothing that provides some protection, such as long pants, long sleeves, and closed shoes. The point is to reduce exposed skin while moving through areas that may have airborne or deposited material, not to substitute for protective equipment.
What to bring
Bring the family Go Kit. Bring any medications needed for up to a week. Bring pets and their Go Kits, because animals left behind may be lost, injured, or worse. The shelter will have most of the other supplies needed, so priority goes to documents, medicines, food, water, power, and animal necessities rather than bulky comfort items.
Evacuating with pets and finding shelter
Pet policy can force a last-minute detour if it is not researched. The guidance cautions that some shelters, such as those of the American Red Cross, take only service animals. Local emergency services may have information on other area shelters that take pets. Local animal shelters or a veterinarian may offer advice on what to do with animals that cannot enter the assigned building.
The companion guide Pets: What to Do During a Chemical Emergency adds operational detail: take pets when leaving, place them in a carrier or crate, carry the pet Ready to Go bag with a two-week supply of their medications, and never leave a pet chained outdoors. It also recommends developing a buddy system with a trusted neighbor who can care for the animal if the owner is not home when the order arrives.
For livestock, horses, birds, reptiles, or small animals such as gerbils and hamsters, the CDC refers readers to Ready.gov, The Humane Society of the United States, and the American Society for the Prevention of Cruelty to Animals, noting that its chemical-emergency pet material focuses mostly on dogs and cats.
If the order comes while you are away
Vehicles offer limited protection. The CDC states that cars, trucks, or other vehicles may not be airtight enough to shield occupants if the household is outside during a release.
In that case, listen to the radio, a mobile news app, or check the phone for messages to find the nearest shelter and go there. Follow instructions from police, fire, or other local officials on arrival and during registration.
Do not drive toward children, loved ones, or pets unless police, fire, or other local officials say it is safe. They may be sheltered where they are, and driving into the hazard area can add casualties and block responders. Instead, use the household emergency plan to stay in contact, relaying messages through texts or other social media as needed. If pets are home alone, contact the designated buddy or trusted neighbor so they can care for the animal until return is authorized.
Cleaning off chemicals and getting help
Evacuation often follows or accompanies decontamination. About Getting Clean | Chemical Emergencies instructs people to focus on getting chemicals off the body, to pay attention to news alerts, and to get help by calling the Poison Control Center at 800-222-1222, calling 911, or going to the nearest hospital.
Exposure can occur through breathing, through splashes on skin or in eyes, or by accidentally eating or drinking chemicals. After moving to fresh air away from the release, the guidance describes blotting rather than rubbing skin, removing clothing, bagging clothing and contact lenses, washing with lukewarm water and mild soap, flushing burning eyes, and bagging used materials, with repeated steps for children while wearing a mask and gloves. Households do not need to identify the substance first; the priority is removal, then medical follow-up and official updates on when it is safe to go outside.
Returning home after the all clear
Return only when it is safe. Residents receive the "all clear" from police, fire, or other local officials when reentry is authorized. After returning, follow their instructions for actions inside the home to remain safe, from ventilation and cleaning to food, water, and yard precautions.
Keep the Go Kits intact until normal services are confirmed, retain receipts and paperwork from the shelter stay, and check on the neighbor or buddy household that helped with rides or animals. Preparedness does not end at the doorstep; it carries through recovery until officials confirm the neighborhood is stable.