Environmental Hazards

Learn how to test for and fix radon, asbestos, lead, mold, and carbon monoxide in your home.

Environmental Hazards
On this page
  1. Carbon Monoxide Is An Immediate Threat
  2. Radon Gas Seeps Up From The Soil
  3. Asbestos Is Safest Left Alone
  4. Lead Paint And Plumbing
  5. Mold Reality Versus The Hype
  6. Comparing Home Hazards
  7. What Mitigation Costs

Carbon Monoxide Is An Immediate Threat

Carbon monoxide is a gas you cannot see or smell. It comes from burning fuel. If your heating system, gas water heater, or stove vents poorly, this gas can build up in your home. It makes you sick very fast and can be deadly.

You need a carbon monoxide detector on every level of your house. Put one right outside all sleeping areas. Test them every month and replace the whole unit every 5 to 7 years. A basic plug in detector costs $20 to $40.

Safety First: If your carbon monoxide alarm goes off, do not look for the source. Get everyone outside immediately and call 911.

Radon Gas Seeps Up From The Soil

Radon is a radioactive gas naturally found in dirt and rocks. It breaks down and floats up. It can enter your house through tiny cracks in your basement floor or crawlspace. Long exposure to high radon levels is the second leading cause of lung cancer in the US.

You should test your home for radon. You can buy a short term test kit at a hardware store for $15 to $30. You leave it in the lowest lived in level of your house for a few days and mail it to a lab. The lab sends you a number. The Environmental Protection Agency says you should fix your home if the number is 4.0 picocuries per liter or higher.

A typical active radon mitigation system pulls gas from under the slab and vents it outside.
A typical active radon mitigation system pulls gas from under the slab and vents it outside.

Fixing a radon problem is straightforward. You hire a pro to install an active soil depressurization system. They drill a hole in your basement floor, dig out a small pit, and run a PVC pipe up to the roof. An inline fan runs constantly to suck the gas out before it enters your living space. This setup usually costs $1,000 to $2,500. Keep in mind that prices vary widely based on your region, home age, and the exact scope of work.

Asbestos Is Safest Left Alone

Builders used asbestos in homes for decades because it resists fire and heat. They stopped using it in the late 1970s. You might find it in old floor tiles, popcorn ceilings, pipe wrap, and siding. Asbestos is not dangerous if it is in good shape. It only becomes a health hazard if you break it, sand it, or cut it. That releases tiny fibers into the air.

If you have an older home and plan to remodel, get an asbestos test first. A pro can take a tiny sample for about $100 to $200. If you find asbestos, the cheapest and safest option is often to cover it up. For example, you can install new vinyl flooring right over old 9x9 asbestos tiles.

If you must remove it, you have to hire a certified abatement team. They seal off the room, wear protective suits, and use special vacuums. This work is expensive. Removing a popcorn ceiling safely can cost $1,500 to $3,000. Prices will change depending on local labor rates and the size of the room.

Lead Paint And Plumbing

Lead is a toxic metal. Homes built before 1978 likely have some lead based paint. Homes built before 1986 might have lead solder in the water supply lines.

Lead paint is mostly a danger to young children who might eat sweet tasting paint chips. The bigger everyday risk is lead dust. Opening and closing an old painted window creates fine dust that settles on floors. You can test your paint with a simple swab kit from the hardware store.

You can manage lead paint by keeping it painted over and intact. This is called encapsulation. If the paint is peeling badly, you need a certified pro to scrape and repaint it safely.

Home testing kits use a chemical swab that turns red or pink when it touches lead.
Home testing kits use a chemical swab that turns red or pink when it touches lead.

Mold Reality Versus The Hype

Mold scares a lot of homeowners. You might see scary news stories about toxic black mold. While mold can cause breathing problems and allergic reactions, it is rarely a reason to abandon your house.

Mold is just a symptom of a water problem. Mold spores are everywhere in the air. They only grow into a colony when they find a wet spot. If you smell musty odors, you probably have a leak or high humidity.

Pro Tip: Do not use bleach to clean mold on porous surfaces like drywall or wood. Bleach only removes the color but leaves the roots. Use a mixture of water and dish soap, or a dedicated mold killer.

If you find a small patch of mold under a sink, you can clean it yourself. Wear a mask and gloves. If you have a massive mold outbreak covering half a basement wall, you need a remediation company. They will set up negative air pressure and safely remove the ruined drywall. The most important step is fixing the water leak. If you do not stop the water, the mold will return.

Comparing Home Hazards

Every house is different. Some face risks from the soil, while others face risks from old building materials. Here is a quick breakdown of common threats.

HazardPrimary SourceTesting MethodFix Difficulty
Carbon MonoxideGas appliances, fireplacesPlug in detectorsEasy DIY
RadonSoil under the houseMail in charcoal kitPro job
AsbestosOld tiles, insulation, ceilingsLab analysis of a samplePro job
LeadOld paint, old pipesChemical swab kit, water testModerate DIY or Pro
MoldWater leaks, high humidityVisual inspection, smellDepends on size

What Mitigation Costs

Fixing these problems usually requires special equipment. Keep in mind that prices vary widely based on your region, home age, and the exact scope of work. Here is a rough look at typical starting prices for professional hazard removal.

CO Detector$30
Lead Paint Test$100
Asbestos Test$150
Radon System$1,500
Asbestos Removal$2,500
Large Mold Cleanup$3,000+
Large mold problems require professional containment so spores do not spread to the rest of your house.
Large mold problems require professional containment so spores do not spread to the rest of your house.

Frequently asked

How often should I test my home for radon?

You should test for radon every two years. You should also test right after a major renovation or if you finish your basement. Structural changes can alter how soil gas enters your home.

Can I remove asbestos floor tiles myself?

It is highly recommended that you hire a pro. If you try to pry them up yourself, they will snap and release dangerous fibers into the air. The safest DIY approach is often laying a new floating floor directly over the old tiles.

Does a standard home inspection check for lead and asbestos?

No. A standard home inspection is a visual check of the house. You have to pay extra for specialized environmental tests. If the house was built before 1980, you should order these tests before closing.

Will a carbon monoxide detector also detect radon gas?

No. Carbon monoxide and radon are completely different gases. You need a dedicated electronic alarm for carbon monoxide. You need a separate charcoal test kit or a specific continuous monitor for radon.

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