35303 Ponder Lane Troy, MO 63379
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Radon Testing

Home Inspections in Troy, MO and Warrenton, MO

Radon Gas Inspection

The most accurate radon test is conducted by a certified individual with a properly calibrated electronic Continuous Radon Monitor.  During the radon gas inspection, the monitor is placed on the lowest level of the home away from walls, windows and air vents. The radon monitor is then programmed and activated. Each hour for 48 hours, the radon monitor samples the air and records the amount of radon present.

During radon gas inspection, it’s important that certain guidelines are followed by the seller or occupant. A good radon gas inspector will have a legal document the seller must sign that indicates their agreement to:

• Keep windows and doors closed during testing (normal traffic is acceptable)

• Keep attic fans or whole house fans off

•  Ensure the radon monitor is not moved or tampered with.

After the radon test, the inspector will download the results from the monitor and render them in an easy to read format such as the chart pictured above. The results are then delivered in writing to the home buyer as well as the buyer’s real estate agent.

Important note: An experienced radon gas inspector will have an electronic radon monitor that has a motion and temperature sensor. This protects home buyers by automatically reporting red flags such as motion alarms when the machine is moved or temperature swings if windows or doors are opened for too long.

1 in 3 Homes We Test Have Elevated Radon Levels.

What Is Radon Gas?

In a nutshell, Radon is a cancer-causing radioactive gas.  It’s produced by natural but radioactive decay of Uranium in soils.  Radon is the heaviest known gas and at 9 times heavier than air it can penetrate leather, wood, drywall, concrete block and most building materials.

You can’t smell, taste or see radon.  It’s colorless and odorless.  There are no immediate symptoms of exposure, only long-term.  By then, it’s usually too late.

Radon Testing Troy, MO and Warrenton, MO

Radon Gas Hazards & Symptoms

Radon is the leading cause of lung cancer in non-smokers. 3,000 deaths per year are attributed to Radon gas. Radon enters the human body through inhalation or ingestion. Those who smoke and have Radon present in their home are at an even higher risk of lung cancer.

A family living in a home with a radon level of 4.0 pCi/l will be exposed to 35 times as much radiation as the Nuclear Regulatory Commission would allow if standing next to a radioactive waste site. The radioactive alpha particles emitted by radon are the same as the alpha particles in plutonium and other dangerous radioactive substances.

There are no immediate symptoms for radon exposure. The effects are long term. Symptoms of lung cancer from radon exposure include:

Persistent cough
Wheezing
Hoarseness
Shortness of breath
Coughing up blood
Chest pain
Frequent respiratory infections
Loss of appetite

Radon Distribution In The U.S.

Radon Gas In Missouri

The vast majority of Missouri is ranked by the EPA as a moderate hazard zone. Almost all homes in the St. Louis area have some level of Radon gas. This includes homes in Warren County, Lincoln County, St. Charles County, Pike County and Montgomery County.

Since most homes have Radon gas, the question becomes how much do they have and what is an acceptable level? The EPA defines the Radon “Action Level” as 4.0 pCi/l or higher average. The Radon Action Level is the threshold for a recommendation of fixing the home.

In the photo we see a chart from a recent radon gas inspection we’ve done at a home in Troy, MO.  The red line shows the EPA recommended action level of 4.0 pCi/l. The black dots and lines show the measured radon gas level inside the home after the radon test. In this case, the EPA’s action level is based on an average of 48 air sample measurements over 48 hours.

•  A 4.0 pCi/l average or higher means a recommendation to fix the home.

•  An average between 2.0 pCi/l and 4.0 pCi/l comes with a recommendation to “consider” fixing the home.

• An average below 2.0 pCi/l is not considered hazardous by the EPA.

Important Note: The EPA’s action level of 4.0 pCi/l is not designed to imply safety below that level. In fact, the EPA says there is no safe exposure limit. The action level was determined using safety as a factor, however the primary driver was a cost-benefit analysis. Fixing all U.S. homes would cost billions and billions of dollars, so a threshold was set that put the mitigation figure in the millions instead.

Can A Radon Gas Problem Be Fixed?

Yes.  Radon mitigation commonly reduces levels of radon gas to much less than the “red line”.  Radon mitigation systems are fairly common in Missouri.  In fact, you’ve probably seen one on the outside of a home. 

Even homes with mitigation systems should be tested occasionally to ensure the mitigation system is working properly.

Certified, Insured & Trusted.

Radon Inspection Vs. Contractor

Beware of radon mitigation contractors who offer testing. The meat of their business is in fixing the home by installing a radon mitigation system. A truly impartial Radon gas inspector is only interested in determining the amount of radon in your home, not in fixing it.
We highly recommend using two separate individuals or companies. One for Radon testing and another for radon mitigation, if needed.

We provide radon testing only and serve the following areas in Missouri. Troy, Warrenton, Wentzville, O’Fallon, Winfield, Moscow Mills, New Melle, Dardenne Prairie, Jonesburg, Hawk Point, Old Monroe and surrounding areas.

Radon Testing Frequency

We recommend radon testing your home twice per year, once at the least, under differing weather conditions. This is true whether radon levels were high or low during previous tests. Radon gas levels can change by season, temperature, atmospheric pressure, weather, aging of the home, etc.

If you have a radon mitigation system installed, it’s even more important to conduct frequent testing. A mitigation system means there’s been a problem in the past. You want to ensure it’s working properly. Conditions change and systems fail.

1 in 3 Homes We Test Have Elevated Radon Levels