Radon is a colorless, odorless, and tasteless radioactive gas that can pose serious health risks if found in high concentrations in your home. Ensuring the accuracy of a radon test is critical for assessing whether mitigation measures are necessary. If you’ve had a radon test conducted and are concerned about the possibility of tampering, which could lead to inaccurate results, it’s important to know what signs to look for. Tampering with a radon test can artificially lower or change the results, potentially misleading you about the level of radon in your dwelling.

Certain red flags can indicate if a radon test might have been compromised. For example, significant and inexplicable shifts in temperature and humidity levels recorded during the test period can be suspicious. Proper testing conditions require that doors and windows are kept closed, except for normal entry and exit, and that the test device remains undisturbed for the duration of the testing period. Evidence to the contrary, such as an air pressure sensor logging frequent openings of doors or windows, could suggest that someone has attempted to alter the test environment.

Understanding the parameters and proper procedures of radon testing is also crucial. A radon test is typically conducted over a minimum of 48 hours with the HVAC system running normally and thermostats set between 67 to 76 degrees Fahrenheit. If you find that the test device was moved or that the environmental conditions were not maintained as per these guidelines, it could mean that the test results are not reliable. Identifying tampering allows you to take appropriate action, ensuring that you have accurate information about radon levels in your home.

Indicators of Radon Test Tampering

When conducting a radon test, it is crucial for the accuracy of the results that the test is not tampered with. Here are specific indicators that may suggest interference with a radon test.

Unusual Test Device Placement

Radon testing equipment by SunRadon, designed for precise readings, should be placed according to strict guidelines. If you find the test device located outside these recommendations—for example, in an area of draft or extreme temperatures—it might indicate an attempt to skew the results.

Inconsistent Radon Levels

If your radon monitor, such as the SunRADON Model 1028™ XP, shows radon levels that fluctuate wildly without a clear reason, this could signal that the device has been moved or tampered with, impacting its continuous monitoring capability.

Physical Evidence on Test Device

Examine your radon test device for fingerprints, residue, or other signs that suggest it has been handled during the testing period. Any unexpected marks or changes to the device should be noted as potential evidence of tampering.

Seal Integrity and Documentation Mismatch

Check if the seals on the test kit are broken or resealed. Furthermore, ensure that all documentation matches up with device serial numbers and calibration dates. Discrepancies could mean the test integrity has been compromised.

Steps for Ensuring Test Validity

To ensure that your radon test provides accurate results, it is crucial to pay attention to the setup, use tamper-resistant features, maintain a secure testing environment, and have the results verified by a professional.

Proper Radon Test Setup

First, make sure your radon test kit is positioned according to the manufacturer’s instructions, which typically involves placing it in the lowest livable area of your home. It should remain undisturbed for the duration specified by the test kit, usually from 2 to 7 days for short-term tests.

Using Tamper-Resistant Features

Select radon test kits that offer tamper-resistant features such as non-reusable seals, motion sensors, or unique identifiers. These features help provide evidence if the test has been moved or altered in any way.

Maintaining a Secure Testing Environment

During the radon test, keep windows and doors closed except for normal entry and exit. Avoid operating fans or other machines that can influence indoor air patterns, and make sure the test isn’t subjected to extreme heat, humidity, or drafts.

Verifying Test Results with a Professional

Once your radon test is complete, send the results to a qualified professional to confirm their validity. Professionals can also perform a follow-up test to compare and ensure consistency in the results, especially if tampering is suspected.


Identifying whether your radon test has been tampered with is crucial for ensuring the accuracy of the results. Look for clear signs such as moved or obstructed devices, or inconsistent data, especially if using a passive test kit. For peace of mind, consider utilizing tamper-evident features or electronic monitors that record any disturbances to the testing environment. If you suspect interference, a repeat test or professional assessment may be your best course of action.


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