You’re not alone if you’re concerned about your home’s air quality. Many homeowners are beginning to ask an important question: how to test for radon? This colorless, odorless gas could be present in your home without any visible signs, yet it’s one of the leading causes of lung cancer in the United States.
In this guide, you’ll learn everything you need to know about radon testing—from understanding what it is to selecting the right type of test and taking action based on your results.
Understanding Radon and Its Risks
Radon is a radioactive gas that forms naturally from the decay of uranium found in soil, rock, and groundwater below the earth’s surface. Although it’s invisible and odorless, prolonged exposure can pose serious health risks. It typically enters homes through cracks in the foundation, floor drains, sump pumps, and even well water.
Though invisible and scentless, radon becomes dangerous when it accumulates indoors. Prolonged exposure to high levels can significantly increase the risk of lung cancer, even in non-smokers. This is why testing is crucial, especially if you live in a region with known radon presence.
When Should You Consider Radon Testing?
There are several situations in which radon testing is strongly advised:
- Before purchasing a new home
- After renovating or finishing a basement
- Test for radon every two to three years as a standard part of maintaining a healthy home environment.
- If you’ve never tested your home before
Testing during colder months can yield more accurate readings since windows and doors are usually kept closed, which helps radon accumulate and become more detectable.
The Two Main Types of Radon Tests
Homeowners can choose between short-term and long-term radon tests, each with its unique benefits depending on your needs and timeline.
Short-Term Testing Kits
To check radon levels in your home, short-term tests are commonly used and are usually left in place for anywhere between two and seven days. They provide a quick overview of current radon levels and are ideal for real estate transactions or initial assessments.
A) Examples of short-term tests:
- Charcoal canisters
- Electret ion chambers
Both absorb radon from the air and are sent to a lab for analysis.
Long-Term Testing Kits
These devices measure radon over a longer period—90 days up to a year—giving a more accurate representation of average levels in the home. They are highly recommended for households looking to monitor radon exposure over time.
How to Test for Radon in Your Home
Wondering how to get started? Here’s a simple checklist to guide you:
- Pick the right location — Usually the lowest lived-in level of your home (basement or ground floor).
- For accurate results, position the test kit properly: at least 20 inches above the floor and away from windows, vents, or exterior walls.
- Close all windows and doors — Ensure all windows and doors are closed to limit air exchange while testing.
- Leave the test undisturbed — Let the kit sit for the recommended duration.
- Mail the kit to a lab (for passive tests) or read the digital monitor if using an electronic device.
Tip: Avoid bathrooms and kitchens as high humidity can impact the results.
What Do Radon Test Results Mean?
Radon is measured in picocuries per liter (pCi/L). Here’s how to interpret the numbers:
- Below 2.0 pCi/L: Low exposure, retest in a few years.
- 2.0 to 3.9 pCi/L: Slight risk, keep monitoring.
- A radon level of 4.0 pCi/L or above meets the EPA’s action threshold: mitigation is strongly advised.
If your results are borderline or high, consider doing a follow-up long-term test for a more accurate average before moving forward with radon mitigation.
DIY Radon Testing vs. Hiring a Professional
You have two options for radon testing:
DIY Radon Testing Kits
- Affordable and widely available
- Easy to use
- Results depend on correct placement and conditions
Professional Radon Testing
- More precise and reliable
- Results delivered faster
- Experts can help interpret the data
- Ideal when buying or selling a home
Professionals typically use continuous radon monitors (CRM) that record levels hourly and provide detailed insights into fluctuations.
What Happens If Radon Levels Are High?
If your home tests are above the EPA’s recommended level, don’t panic. Effective radon mitigation can dramatically reduce your exposure.
Common mitigation solutions include:
- Sub-slab depressurization: A pipe-and-fan system that draws radon from beneath your home and vents it outdoors.
- Sealing foundation cracks: Helps limit radon entry, though it’s not a standalone fix.
- Improved ventilation: Adding air exchange systems in basements or crawl spaces can help lower radon concentration.
Most mitigation systems can be installed within a single day and start working immediately.
Final Thoughts: Your Health Begins at Home
Testing your home for radon isn’t just a good idea—it’s a vital step in protecting your family from hidden health risks. Whether you’re living in an old home or moving into a new one, knowing your radon levels can help you take informed action and create a safer environment.
If you’re unsure where to begin or want expert help, visit DSM Radon. DSM Radon Specialists offer certified radon testing and mitigation services throughout Iowa. Their experienced team provides reliable solutions designed to improve your indoor air quality and protect your health—one test at a time.
Frequently Asked Questions (FAQ)
Q: How often should I test for radon?
At least every two years, or whenever making changes to your home’s structure or ventilation.
Q: Are radon test kits accurate?
Yes, if used according to instructions. For more certainty, follow up with a long-term test or professional assessment.
Q: Is radon only a concern in basements?
No. While basements often have the highest levels, radon can move through your entire home via airflow.
Q: Can new homes have high radon levels?
Absolutely. In fact, newer homes can sometimes trap radon more effectively due to tighter seals and insulation.