About Us
Order Inspection
Radon Inspections
Order Report
Contact Us

Gaylen Ohman


Pro Certified Home Inspections has been trained and certified in radon measurement by the National Environmental Health Association's National Radon Proficiency Program. NRPP is a nationally recognized certification program for radon professionals maintaining the highest level of ethics and quality. We are proud to be recognized and associated with this prominent organization.

What is Radon?

Radon is a harmful radioactive gas that comes from the natural breakdown of uranium in the soil, rock and water. Radon gas can be found almost anywhere. You cannot see, smell or taste radon, but it may be a serious health concern in your home.

Minnesota Radon Map

How harmful is Radon?

Radon radioactive gas is believed to be the second leading cause of lung cancer. The EPA, Surgeon General and The Center for Disease Control, have all agreed that continued exposure to radon gas can cause lung cancer. It is their position that all homes should be tested for radon gas exposure, and that all homes testing over 4 picoCuries per liter (pCi/l) should have a system installed by a qualified radon mitigation service to reduce the radon concentrations in the indoor air of a building. Radon levels less than 4 pCi/L still pose a risk, and in many cases, action to lower such levels should be considered.

How does Radon enter the home?

Typically the air pressure inside your home is lower than the pressure in the soil surrounding your home's foundation. Due to the higher pressure in the soil, the radon gas has a tendency to travel from the soil through foundation cracks and other openings in your home. Once inside the building, the radon can become trapped and harmfully concentrated.

Common openings in the home that easily allow radon gas to enter:


Cracks in foundation floors and walls


Cavities in walls


Gaps around sumps, drains, service pipes, wiring and other utility penetrations


Gaps in suspended floors above crawl spaces


Joints in foundation construction materials


Crawl spaces that open directly into the home


The water supply

Radon in the water supply?

Radon may also be present in water, particularly well water. When water is used for showering and other household uses , about one ten thousandth of the radon in water is typically released into the air. The more radon there is in the water, the more it can contribute to the indoor radon level.

How is Radon measured?

The EPA recommends that testing device(s) be placed in the lowest level of the home suitable for occupancy. This means testing in the lowest level (such as a basement), which a buyer could use for living space without renovations. Usually, the buyer decides where to locate the radon test, based on their expected use of the home.  A buyer and seller should explicitly discuss and agree on the test location to avoid any misunderstanding.  Their decision should be clearly communicated to the inspector performing the test


Pro Certified Home Inspections performs short-term radon testing when results are needed quickly for a real estate transaction. Testing devices are typically left in place for 2 to 7 days. Remember, tests less than 48 hours long are not valid. We provide our clients with a simultaneous testing option where two short-term tests are made at the same time, in the same location and for at least 48 hours. This simultaneous testing procedure improves the precision of the short-term radon test. 


Special procedures must be taken during a short-term test. These procedures are referred to as "closed-house conditions". The conditions include:


all windows must be closed;


air exchange systems must be turned off (except furnace);


if the test is 2-4 days in length, the house must be under closed-house conditions for 12 hours immediately prior to testing; and


If the test ranges from 4-7 days, the EPA recommends that closed-house conditions be maintained.  

Certified... Professional... Experienced... Insured
To order your inspection call

Toll Free: (866) 662-0773