7 Critical Facts About Radon 

  Learn critical facts about Radon Gas including how it enters a home, how it interacts with the human   body, which states are at risk and more. 

What is Radon?

Radon is a radioactive gas that occurs naturally in the environment by seeping out of rocks and soil. Radon comes from the depletion of uranium that has been in the ground since Earth's formation.

What is Radon

Radon flows from the soil into outdoor air and into the air in homes and commercial buildings from the movement of gases in the soil beneath the structure.

Outside air typically contains extremely low levels of radon, but it builds up in larger concentrations inside a building when the gas is unable to disperse

Unlike better-known home hazards like asbestos and lead-based paint, many people are unaware of the danger of household radon exposure because the gas is odorless, tasteless and colorless.

Back to Top↑

What are the Health Effects of Radon Gas?

The U.S. Environmental Protection Agency estimates that 1 of 15 homes in the United States and as many as 1 of 3 homes in some states about 7 million homes have high radon levels.

So you might be asking how does Radon cause so many problems?

Here's the deal.

Radon is a chemically inert gas that is electrically uncharged but it is also radioactive, and it is this fact, that creates the potential for trouble.

Radioactive Atom - Radon

You don't have to be a nuclear engineer to understand that radioactive materials decay spontaneously, we should have all learned that in a basic chemistry class, however, within this decay process, radon progeny are formed which do carry an electric charge, this allows them to bind to tiny dust particles in the air, which can be inhaled by the lungs and adhere to the lining of your lung tissue. 

These deposited atoms decay within the lung tissue by emitting a type of radiation called, alpha radiation, which holds the power to damage cells in the lung and mutate the structure of your DNA. This can start a chain reaction process that can lead to lung cancer.

According to the study on the Biological Effects of Ionizing Radiation, 1 in 10 of all lung-cancer deaths in the United States; which amounts to a number between 15,400 to 21,800 per year, can be attributed to radon.

Back to Top

How is Radon Measured?

Radon in the US is measured in PicoCuries per Liter.

The EPA recommends that action is taken on any home recording radon levels between 2-4pCi/L and above.

The World Health Organizations recommends that measures should be taken on any home producing radon levels at or above 2.7 pCi/L.

There are two types of devices for measurement:

1. Passive devices are ones that do not need power to function.Passive Radon detector

The group includes alpha track detectors, charcoal canisters, and charcoal liquid scintillation detectors.

They are sometimes available in drug, hardware, and other stores, the Internet, and through some laboratories. 

These test kits are designed to be used for two or four days before being returned for analysis by the laboratory that provides it. A return mailer is provided with the kit.

One thing to keep in mind, some of the charcoal technologies are prone to interference by high humidity, so may not be appropriate for use in all buildings.

2. Active devices require power to function.

Active Radon Monitoring System

This group of radon testing devices consists of different types of continuous monitors and continuous working level monitors.

Active monitors can provide data on the range of variation within a given test period. Some are designed to detect and deter interference. These tests often cost more than passive testing but are typically more accurate due to the degree of sophistication with this technology itself

The electronic continuous radon monitor is set on a tripod and is designed to precisely measure (with 99.9% certainty) the actual radon levels in a house for 52 hours.

How do you know that the Radon test results were accurate?

There are four common factors that could influence the results of a radon test so make sure they are accounted for during the test:

  1. Time of year - Radon levels usually are highest during the winter months (I was getting my test done in November). He showed me when my furnace kicked on by showing me slight spikes in the radon levels during that time but also reiterated that my radon levels were still elevated even when the furnace was not running.
  2. The location of the test - The EPA recommends testing for radon in the lowest livable level of your home, where radon levels usually are highest in the home. They put my test in the basement as far away from my furnace as possible to get a more accurate measurement.
  3. Weather patterns - Do not conduct a short-term test during conditions that can influence the test results, such as stormy weather or very high winds. If you are expecting thunderstorms, postpone the test until after the weather has calmed down.
  4. Testing interference - The test device should never be moved, and a person should not open doors and windows during the test, as these actions can result in understated radon levels. This part was easy because we were not moved into the house yet.

In addition to the four influences above, if you have your home professionally tested, make sure that the Radon testing company has a national accreditation such as the American Association of Radon Scientists and Technologists (AARST)

Back to Top↑

How Does Radon Enter Homes?

According to the World Health Organization, Radon primarily enters homes through the following areas:

  • cracks in the floors
  • at floor-wall junctions
  • gaps around pipes or cables
  • small pores in hollow-block walls
  • sumps or drains

Radon levels are usually higher in basements, cellars or living spaces in contact with soil, this is also why it is the preferred area to test radon levels within a home.Inspectors looking for radon entry points

Another concept to keep in mind is that the total concentration of radon can vary from home to home. Residential radon tests on air quality indicate that homes adjacent to one another can have a high degree of variance between total radon levels, thus rendering one home safe and another a serious health risk.

Total concentration of radon in a home depends on a few factors including:

  • the total amount of uranium deposits in the rocks and soils beneath the home's foundation
  • the rate of exchange between indoor and outdoor air
  • the ventilation system within a home
  • how air tight a building is upon construction.
  • the easy of passage for radon to travel from the soil and rocks into the home
Back to Top↑

How to Get Rid of Radon

Well, to be perfectly honest, you really can never get rid of radon, radon breaks down over time so you can't wave a magic wand and say bye bye, what you can do is make sure you limit the total amount that is able to get into your home, this is done through a process called radon mitigation.

With that being said, 

Let's look at the 2 different types of Radon Mitigation Systems you can have installed.

Passive Radon Mitigation System

A passive radon mitigation system is typically installed when a home is being constructed.

The passive system contains only two components: 

  • a pvc ventilation pipe that extends from beneath the slab up to the eave line of the roof
  • a physical barrier between the soil and house foundation

A passive system relies on natural pressure differentials and air currents to eliminate radon from the home.

Oftentimes when a home is being built, the building company will install a passive system without ever testing the home for radon.

This can be a problem because passive radon systems do not bring extremely high levels of radon below the EPA recommended 4.0.

Many home buyers do not realize this when purchasing a home with a passive system, but they might be putting their family's health at risk. 

Active Radon Mitigation System 

Active Radon Mitigation SystemAn active radon mitigation system is installed when homes contain elevated levels of radon gas.

It is referred to as an active system because the fan is always pulling radon from beneath the home, so it doesn't have the opportunity to enter and venting it outside. This is referred to as the sub-slab depressurization method.

The active system has four components:

There are several ways for an active mitigation system to be installed depending on the layout of the home, this includes crawlspaces, the overall size of the home, the current radon level, the composition of your soil and more.

The majority of active radon removal systems can be installed in just a few hours, depending on the complexity of the home.

An EPA certified crew should always walk you through the process of radon removal including, how the piping and fan are going to be installed to ensure radon is being removed if the most efficient and effective manner. The average radon mitigation system can be installed for under $1,500. Every home is built a little differently, and therefore, there is no universal price for every home. 

Back to Top↑

States That Are Most at Risk for High Levels of Radon

Radon can be found in any state but there are certain states that are at a much higher risk.

Radon Zones can be found at the EPA website here


List of States with High Levels of Radon Gas
  • Colorado
  • Idaho
  • Illinois
  • Indiana
  • Iowa
  • Kansas
  • Maine
  • Minnesota
  • Montana
  • Nebraska
  • New York
  • North Dakota
  • Ohio
  • Pennsylvania
  • South Dakota
  • Virginia
  • Wyoming

High radon areas in the U.S. tend to be in the northern section of the country due to the types of soils found there. Most of all of these states fall in zone one, as detailed in the map above, which are designated for parts of the U.S. with the highest levels of radon ie. 4 (pCi/L) or higher.

Back to Top↑

Radon Resistance in New Home Construction Radon Resistant Home Construction

Features that reduce household radon levels can be incorporated into new homes. In fact, eleven states now require radon-resistant features in new homes. Every home should be tested before, or soon after, you move in.

Even homes built with radon-resistant construction features need to be tested for the safety of the occupants. If high radon levels are found, it is easier and costs less to reduce radon levels in homes that are built radon-resistant.

Using common construction materials and easy to follow techniques, builders can provide a public health service by constructing new homes that are resistant to radon entry, therefore, helping to reduce a buyers' risk of lung cancer.

According to the EPA for Radon Resistant Construction,

  • Radon-resistant features can be an important selling point for health-conscious home-buyers.
  • Radon-resistant new construction typically costs a builder between $250 and $750, depending on the size and location of the house.
  • RRNC can cost less than $250 if the builder already uses some of the same techniques for moisture control. This cost is much less than the cost to fix a radon problem if a new homeowner tests for radon and finds elevated levels (4 pCi/L or more)
Back to Top↑
If you need additional information about scheduling a Radon Test or to Get a Radon Mitigation Quote, please click on the link below now to contact a member of our team.
Contact Us