Do not place the test device in drafts from heating or air conditioning vents or fans.

Do not place the test device in closets, kitchen, bathroom, laundry room or other closed or high humidity areas. Bedrooms, living rooms, or dens are good testing locations.

Either place the measurement device on a stable surface (but not on a stone surface) or, if called for in the device instructions, hang the device(s) at normal breathing level. 

Do not place the test device on or near heat sources nor in direct sunlight.

Test under normal occupied temperature (65 to 80OF).

Place the test device at least 20 inches above the floor or, if the device is to be suspended, <8 feet above the floor and a minimum of 12 inches below the ceiling.

Place the test device at least 3 feet from windows or exterior doors or otherwise, a minimum of 12 inches from an exterior wall.

Place the test device at least 4 inches from other objects.

At the test location per device instructions, open the test device or start the CRM.

Record start time and date below and, if appropriate, on the test device.

Leave the testing in progress notice in a conspicuous location. 

Initiate any tamper resistant methods if used.

Do not place the test device in drafts from heating or air conditioning vents or fans.

Do not place the test device in closets, kitchen, bathroom, laundry room or other closed or high humidity areas. Bedrooms, living rooms, or dens are good testing locations.

Either place the measurement device on a stable surface (but not on a stone surface) or, if called for in the device instructions, hang the device(s) at normal breathing level. 

Do not place the test device on or near heat sources nor in direct sunlight.

Test under normal occupied temperature (65 to 80OF).

Place the test device at least 20 inches above the floor or, if the device is to be suspended, <8 feet above the floor and a minimum of 12 inches below the ceiling.

Place the test device at least 3 feet from windows or exterior doors or otherwise, a minimum of 12 inches from an exterior wall.

Place the test device at least 4 inches from other objects.

At the test location per device instructions, open the test device or start the CRM.

Record start time and date below and, if appropriate, on the test device.

Leave the testing in progress notice in a conspicuous location. 

Initiate any tamper resistant methods if used.

Attached to this report is a copy of the actual test data taken from a Minnesota Department of Health approved testing device. The test was performed in accordance with the current ANSI/AARST standards and guidelines accepted for radon testing.

Radon is the second leading cause of lung cancer, after smoking. The U.S. Environmental Protection Agency (EPA) and the Surgeon General strongly recommend taking further action when the homes radon test results are 4.0 pCi/l (picocuries per liter of air) or greater. Radon levels less than 4.0 pCi/l still pose some risk and in many cases may be reduced. The annual national average indoor radon level is about 1.3 pCi/l while annual outdoor radon levels average 0.4 pCi/l. The higher a homes radon level, the greater the health risk to you and your family. Smokers, former smokers, and individuals with a family history of lung cancer are at especially high risk. EPA recommends that you use an NRPP or NRSB or State licensed contractor trained to fix radon problems. You can contact your state radon office to obtain information, including a list of State-approved radon contractors who can fix or can help you develop a plan for fixing the radon problem.

Test result is 4.0 pCi/L or greater:

▪Fix the building if test results indicate occupants may be exposed to radon concentrations that meet or exceed the EPA action level of 4.0 pCi/L.
▪Efforts to reduce radon concentrations are not complete until a retest provides evidence of effectiveness.
        ▪Complete a short term radon test between 24 hours and 30 days after the installation of a mitigation system.
        ▪Retest every 2 years to ensure the system remains effective.

Test results between 2.0 and 4.0 pCi/L

▪Consider fixing the building if the test results indicate radon levels greater than half the action level.
▪Tests conducted when heating systems are active both day and night are more likely to provide a clear characterization of potential radon hazards.

When to Retest

• Retest every 5 years if NO mitigation system is installed.
• Retest in conjunction with the sale of any new or existing buildings.

Be certain to test again if and when any of the following circumstances occur:

• A new addition is constructed or alterations for building rehab or reconfiguration occur;
• A ground contact area not previously tested is occupied, or a home is newly occupied;
• Heating and cooling systems are significantly altered;▪Ventilation is significantly altered by extensive weatherization, changes to mechanical systems or comparable procedures;
• Significant openings to the soil occur due to:
• Groundwater or slab surface water control systems that are altered or added (ex. sumps, perimeter drain tile, shower/tub retrofits) or,
• Natural settlement causing major cracks to develop
• Earthquakes, construction blasting, or formation of sink holes nearby; or
• A mitigation system is altered, modified or repaired.

MN MDH Phone - 651-201-4601

email: health.indoorair@state.mn.us

website: http://www.health.state.mn.us/divs/eh/indoorair/radon/index.html

For homes with low radon concentrations, it is recommended to retest is any of the following apply:

• If the home was unoccupied during the test, the home should be retested after occupancy;
• If the home is located in an area of karst or glacial moraine geology, it should be retested over 12 months. 
• If the initial test was conducted during abnormal climatic events such as, prolong drought.  
• If occupied by a new owner;
• If the initial test was less than 4 pCi/L, retest every very five years after initial testing;
• If a new addition is added;
• If an alteration is made that could change the ventilation pattern;
• If major cracks or penetrations occur in the foundation walls or slab;
• If significant nearby construction blasting or earthquakes occur;
• If changes are made or happen to an installed mitigation system; or
  If a ground-contacted area is occupied that was not previously tested.