What To Expect During Professional Radon Testing
Independent Philadelphia radon testing procedures designed for homeowners, real estate transactions, and older Pennsylvania homes. Liberty Radon Diagnostics follows DEP-aligned deployment standards, laboratory-backed analysis, and documented testing procedures focused on accuracy and consistency.
PA DEP–Aligned
Independent Measurement Only
The Independent Radon Testing Process
STEP 1
Scheduling & Property Review
We begin by confirming that your property is within our Philadelphia-area service region and reviewing relevant details about older foundations, finished basements, additions, and real estate transaction requirements before deployment.
STEP 2
Radon Testing Device Deployment
On the day of deployment, a certified professional places an activated charcoal test device on the lowest livable level of the home. Devices are positioned away from drafts, windows, and heat sources while maintaining proper closed-building testing conditions.
STEP 3
Procedural Monitoring & Integrity
Throughout the testing period, Liberty Radon Diagnostics follows tamper-aware deployment procedures and environmental monitoring practices designed to protect the integrity of the test. Chain-of-custody handling and independent measurement standards are maintained from deployment through retrieval so that results remain defensible and unbiased.
STEP 4
Laboratory Analysis
After retrieval, test devices are transferred to a certified laboratory for analysis. Each device is processed using established analytical methods, with results generated under laboratory-backed quality control standards. This ensures that your radon report is based on accurate, properly handled measurements.
STEP 5
Results & Independent Interpretation
Once laboratory results are available, Liberty Radon Diagnostics provides a clear written report that explains your radon levels in the context of EPA action levels and relevant guidance. Because we do not perform mitigation services, our interpretation remains independent and free from mitigation sales conflicts of interest.
Why Independent Testing Matters
Certified Laboratory Analysis
Independent Measurement Only
No Mitigation Sales Conflict
DEP-Aligned Procedures
Tamper-Aware Deployment Standards
Independent Measurement Only
No Mitigation Sales Conflict
DEP-Aligned Procedures
Tamper-Aware Deployment Standards
Frequently Asked Questions
How long does radon testing take?
Standard professional radon testing requires a minimum of 48 hours for the device to remain deployed in the home. Including setup and retrieval, most testing windows span two to three days to satisfy DEP-aligned measurement standards.
Can we remain in the home during testing?
Yes, you can remain in the home. However, it is critical that 'closed-building conditions' are maintained throughout the duration of the test to ensure that environmental variables do not interfere with the accuracy of the concentration readings.
What are closed-building conditions?
Closed-building conditions involve keeping all windows and external doors closed, except for normal entry and exit. High-volume ventilation systems and fireplaces should also remain unused. These conditions ensure the air being tested is representative of steady-state indoor levels. These testing conditions help ensure Philadelphia-area radon measurements remain accurate and representative of normal indoor air conditions.
What if elevated radon levels are detected?
If results meet or exceed the EPA action level of 4.0 pCi/L, we recommend consulting with a certified radon mitigation contractor. Because Liberty Radon Diagnostics is independent, we provide the data you need to make an informed decision without any conflict of interest.
Why use independent testing?
By working with an independent measurement-only radon professional, your results remain free from mitigation sales pressure and conflicts of interest.
Are Philadelphia rowhomes at risk for radon?
Yes. Radon is produced by the natural breakdown of uranium in the soil and is common throughout Pennsylvania. Philadelphia rowhomes — especially older homes with stone or masonry foundations — can develop cracks, utility penetrations, and basement entry points that allow radon gas to enter from beneath the structure. Even with shared walls, rowhomes can still experience elevated indoor radon levels depending on airflow, foundation conditions, and basement construction.
Do finished basements still require testing?
Absolutely. Radon typically enters through the foundation, and finishing a basement does not seal out the gas; in fact, it can sometimes trap concentrations behind walls or flooring. Testing the lowest livable level is essential, regardless of whether it is finished.
