What You Need to Know When the Power Goes Out Unexpectedly

Safe Drinking Water

When power goes out, water purification systems may not be functioning fully. Safe water for drinking, cooking, and personal hygiene includes bottled, boiled, or treated water. Your state, local, or tribal health department can make specific recommendations for boiling or treating water in your area. For more information, visit Use Safe Water After a Disaster or Emergency.

Medications

Some drugs require refrigeration to keep their strength, including many liquid drugs.

• When the power is out for a day or more, throw away any medication that should be refrigerated, unless the drug’s label says otherwise.
• If a life depends on the refrigerated drug, but the medications have been at room temperature, use them only until a new supply is available.
• Replace all refrigerated drugs as soon as possible.

Resources for people with chronic disease or disability.

Extreme Heat and Cold

First Aid for Electrical Shock

If you believe someone has been electrocuted take the following steps:

1. Look first. Don’t touch. The person may still be in contact with the electrical source. Touching the person may pass the current through you.
2. Call or have someone else call 911 or emergency medical help.
3. Turn off the source of electricity if possible. If not, move the source away from you and the affected person using a nonconducting object made of cardboard, plastic or wood.
4. Once the person is free of the source of electricity, check the person’s breathing and pulse. If either has stopped or seems dangerously slow or shallow, begin cardiopulmonary resuscitation (CPR) immediately.
5. If the person is faint or pale or shows other signs of shock, lay the person down with the head slightly lower than the trunk of his or her body and the legs elevated.
6. Don’t touch burns, break blisters, or remove burned clothing. Electrical shock may cause burns inside the body, so be sure the person is taken to a doctor.

Power Line Hazards and Cars

If a power line falls on a car, you should stay inside the vehicle. This is the safest place to stay. Warn people not to touch the car or the line. Call or ask someone to call the local utility company and emergency services.

The only circumstance in which you should consider leaving a car that is in contact with a downed power line is if the vehicle catches on fire. Open the door. Do not step out of the car. You may receive a shock. Instead, jump free of the car so that your body clears the vehicle before touching the ground. Once you clear the car, shuffle at least 50 feet away, with both feet on the ground.

As in all power line related emergencies, call for help immediately by dialing 911 or call your electric utility company’s Service Center/Dispatch Office.

Do not try to help someone else from the car while you are standing on the ground.

Avoid Carbon Monoxide

For important information about the risk of carbon monoxide poisoning during a power outage, see the following resources.

• Returning Home After a Disaster: Be Healthy and Safe
• Carbon Monoxide Poisoning After a Disaster
• Carbon Monoxide Poisoning Fact Sheet [National Center for Environmental Health].

Dangers of Gasoline Siphoning

Gasoline may be in short supply, before, during, and after natural disasters, such as hurricanes and floods. When there is not enough gasoline, people may want to take gasoline from one container and put it into another. This can be done by siphoning.

• Siphoning gasoline can harm your health. Do not try to siphon gasoline. It can cause serious injury or illness.
• Siphoning is when you use your mouth or a pump to suck a liquid such as gasoline out of one container, such as a gas tank, through a funnel or tube and into another container
• Possible injuries and illness from any form of siphoning include:
  • Burns and injury from unintentional combustion of gasoline and/or gasoline vapors. This may happen if the gasoline or its vapors come into contact with a lit cigarette or static electricity.
  • Confusion, drowsiness, headache or problems concentrating from breathing gasoline vapors
  • Irritation of skin, eye or mucus membranes on contact
• Other possible injuries and illness from siphoning when you use your mouth for suction include:
  • Lung damage, if gasoline is inhaled into the lungs (aspiration) during mouth-based siphoning
  • Gastrointestinal (GI) signs and symptoms such as nausea, vomiting and stomach pain if any gasoline is swallowed
  • Irritation of mucous membranes inside your mouth, throat and stomach on contact
• If you do breath gasoline fumes or swallow gasoline and feel ill, see a doctor and/or call the poison center for help at 1-800-222-1222

Safety at Work During Power Recovery

As power returns after an outage, people at work may be at risk of electrical or traumatic injuries as power lines are reenergized and equipment is reactivated. CDC recommends that employers and employees be aware of those risks and take protective steps if they are in contact with or in proximity to power lines, electrical components, and the moving parts of heavy machinery.

More information on electrical safety is available in our fact sheet on Worker Safety in a Power Outage and Electrical Safety [NIOSH].

Be Prepared for an Emergency

CDC recommends that people make an emergency plan that includes a disaster supply kit. This kit should include enough water, dried and canned food, and emergency supplies (flashlights, batteries, first-aid supplies, prescription medicines, and a digital thermometer) to last at least 3 days. Use battery-powered flashlights and lanterns, rather than candles, gas lanterns, or torches (to minimize the risk of fire).

To learn more information on emergency plans and supply kits, see Emergency Preparedness and You.

Impact of Power Outage on Vaccine Storage

A power outage has significant implications for vaccine storage. For CDC guidance regarding vaccine storage issues, see Impact of Power Outages on Vaccine Storage.