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How Does Carbon Monoxide Risk Increase After Disasters?

Last updated October 26, 2026

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The short answer

Why Disasters Boost the Danger

After a storm or flood, power often goes out for hours or days. In that time, many homeowners turn to portable generators, charcoal grills, or propane stoves to cook and keep appliances running. Those devices release carbon monoxide, a colorless and odorless gas that can be deadly in enclosed spaces.

Even a generator placed on a porch or near an open window can push exhaust into your home. Floodwater may also shift or damage furnaces, water heaters, and gas lines, creating leaks you cannot detect by smell. The combination of more fuel-burning devices and damaged equipment makes the risk much higher than on a normal day.

  • Run generators at least 20 feet from doors, windows, and vents
  • Never use grills or camp stoves inside your house or garage
  • Check that outdoor vents and chimneys are clear of debris
  • Place a carbon monoxide detector on every level of your home
  • Test detectors monthly and replace batteries as needed
  • Leave the house immediately if the alarm sounds

How Flooding Affects Appliances

Floodwater can soak the controls and burners of gas appliances, leaving them unsafe to restart. Sediment and debris can block exhaust flues, trapping carbon monoxide inside your walls and rooms. Even if an appliance looks dry, internal parts may have corroded or shifted during the flood.

After water recedes, do not turn on any fuel-burning appliance until a qualified professional has checked it. A plumber or HVAC contractor can inspect gas lines, vents, and combustion chambers for damage. This step is important because a small blockage can create a serious hazard that is invisible to you.

Signs of Exposure to Watch For

Carbon monoxide poisoning often mimics the flu without a fever. Symptoms include headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. If you feel unwell and suspect exposure, get to fresh air immediately and see a doctor.

Pets and children may show symptoms first because their bodies process the gas differently. If multiple people in your home feel sick at the same time, that is a strong warning sign. Do not wait for symptoms to pass on their own; leave the building and call for help.

Steps to Protect Your Household

The most reliable protection is a working carbon monoxide detector with fresh batteries. Install one on each level of your home, especially near sleeping areas. Test the alarms after any major weather event to confirm they still function after power surges or moisture exposure.

Keep a list of emergency contacts, including your utility company and a local plumber, written down in a safe place. If you live in Chapel Hill, keep that list near your main electrical panel so you can find it quickly. Review your home's ventilation paths before a storm so you know where to clear debris afterward.

When to Get Professional Help

If your detector alarms or you suspect a leak, leave the house and call emergency services from outside. Do not re-enter until the source is found and fixed. After a flood, have a qualified professional inspect all gas appliances, chimneys, and vents before you use them again.

Water damage in your home can hide problems that affect air quality and safety. Local water damage pros can assess structural moisture and document conditions for your insurance claim. Policies vary, and your insurer decides what is covered. For thorough drying and mold prevention, you may also need a water damage inspection service.

  • Never ignore a sounding carbon monoxide alarm
  • Store portable generators dry and away from living spaces
  • Keep vents and flues clear of mud and leaves
  • Replace appliances that were submerged in floodwater
  • Ask a professional to test gas lines after any flood
  • Teach family members the symptoms of exposure

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Frequently asked questions

How long does carbon monoxide stay in the air?

Carbon monoxide lingers in an enclosed space until the source stops and fresh air enters. Opening windows and doors helps clear it within a few hours, but the source must be off first. If a generator or appliance keeps running, the gas will keep building up, so always shut off the device before ventilating.

Can a power outage alone cause carbon monoxide?

No, a power outage by itself does not produce carbon monoxide. The risk comes from how you respond to the outage, such as running a generator indoors or using a gas oven for heat. Any fuel-burning device used in a closed space creates the hazard, so plan ahead for safe alternatives.

What should I do if my detector goes off?

Treat every alarm as a real emergency. Leave your home immediately and get to fresh air, then call emergency services from outside. Do not re-enter until responders say it is safe. Afterward, have a qualified professional find and fix the source before you return.

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