Radon Testing Long Island — Professional Radon Inspection for Nassau & Suffolk County

Radon is the second leading cause of lung cancer in the United States, responsible for an estimated 21,000 deaths each year according to the EPA. You can’t see it, smell it, or taste it — but it could be in your home right now. The only way to know is to test.

At The Inspection Boys, we provide professional radon testing across Long Island, Nassau County, Suffolk County, Queens, and Brooklyn. Our InterNACHI-certified inspectors use continuous radon monitors (CRMs) — the most accurate testing method available — to give you reliable results you can count on.

📞 Schedule your radon test today: (516) 591-3262

What Is Radon and Why Should Long Island Homeowners Care?

Radon is a naturally occurring radioactive gas produced by the breakdown of uranium in soil and rock. It seeps into homes through foundation cracks, gaps around pipes, sump pits, and other openings in contact with the ground.

While New York State has areas of elevated radon risk across all regions, Long Island’s geology — a mix of glacial deposits, sandy soils, and underlying bedrock — means that radon levels can vary significantly from one property to the next. Your neighbor’s home might test low while yours tests high. The only way to know your risk is to test your specific property.

Radon Facts Every Homeowner Should Know

Radon is the #1 cause of lung cancer among non-smokers (EPA)
The EPA action level is 4.0 pCi/L — any home above this should be mitigated
1 in 15 homes nationwide has elevated radon levels
New York requires radon testing disclosure in real estate transactions
Radon levels can change seasonally — winter levels are often highest
Radon mitigation systems are effective and affordable when needed

Our Radon Testing Process

We use professional-grade continuous radon monitors (CRMs) that provide hour-by-hour readings over a minimum 48-hour testing period. This is the gold standard in radon testing — far more reliable than DIY charcoal canisters.

Step 1: Monitor Placement

Our certified inspector places the CRM in the lowest livable area of your home — typically the basement or ground-floor level. The monitor is positioned according to EPA testing protocols, away from windows, doors, and exterior walls to ensure accurate results.

Step 2: 48-Hour Continuous Monitoring

The monitor records radon levels every hour for a minimum of 48 hours. This continuous data captures fluctuations throughout the day and night, providing a much more accurate picture than a single-point test.

Step 3: Data Analysis and Reporting

After the testing period, our inspector retrieves the monitor and generates a detailed report showing hourly readings, average concentration, and whether your home exceeds the EPA action level of 4.0 pCi/L. You receive a clear, easy-to-understand report with specific recommendations.

Step 4: Guidance on Next Steps

If elevated radon is found, we explain your options clearly. Radon mitigation systems — typically sub-slab depressurization systems — are highly effective at reducing radon levels by up to 99%. We can recommend qualified radon mitigation contractors in the Long Island area.

Don’t guess about radon. Test. Call (516) 591-3262 today.

When Should You Test for Radon?

Buying a Home on Long Island

Radon testing is the single most important add-on to a standard home inspection. If your new home has elevated radon, you can negotiate for the seller to install a mitigation system before closing — potentially saving you thousands of dollars.

Selling Your Home

A pre-listing radon test shows buyers you’re transparent about your home’s condition. If levels are low, it’s a selling point. If they’re elevated, you can address the issue proactively rather than having it derail a deal during the buyer’s inspection period.

You’ve Never Tested

The EPA recommends that every home be tested for radon, regardless of location or age. If you’ve lived in your Long Island home for years and never tested, now is the time. Long-term exposure to elevated radon is the concern — the sooner you know, the sooner you can act.

After Renovations

Major renovations — especially those involving the foundation, basement, or HVAC system — can change how radon enters and circulates in your home. Re-testing after significant work is a smart precaution.

Radon Testing Areas We Serve

Nassau County Radon Testing

We provide radon testing throughout Nassau County including Garden City, Great Neck, Manhasset, Roslyn, Jericho, Syosset, Massapequa, Levittown, Hempstead, Long Beach, Freeport, Hicksville, Plainview, and all surrounding communities.

Suffolk County Radon Inspection

Our Suffolk County coverage includes Smithtown, Huntington, Cold Spring Harbor, Northport, Babylon, Islip, Bay Shore, Patchogue, Centereach, Commack, Hauppauge, Brookhaven, Riverhead, and all Suffolk County towns.

Queens & Brooklyn

We also serve Queens and Brooklyn including Astoria, Bayside, Forest Hills, Flushing, Jamaica, Bay Ridge, Park Slope, Flatbush, and surrounding neighborhoods.

Why Choose The Inspection Boys for Radon Testing

200% Money-Back Guarantee

Our industry-leading 200% money-back guarantee means if you’re not satisfied with our service, we’ll refund your entire fee AND pay for another inspector. No other radon testing company on Long Island makes that promise.

Professional-Grade Equipment

We use continuous radon monitors — not cheap charcoal test kits. Our CRMs are calibrated regularly and provide hour-by-hour data that gives you a complete picture of your home’s radon levels.

InterNACHI Certified

Our inspectors are certified through the International Association of Certified Home Inspectors and follow EPA radon testing protocols. You get a professional, standardized test every time.

Fast, Affordable Results

Results are available within 48-72 hours of monitor placement. Our radon testing pricing is competitive and transparent — you know the cost before we start.

Bundled Savings

Add radon testing to any home inspection and save. Many of our Long Island clients combine radon, mold, and general home inspection services for comprehensive coverage at a better price.

Understanding Radon Levels

Here’s what your radon test results mean:

Below 2.0 pCi/L: Low risk. No action needed, but re-test every 2-5 years.
2.0 – 3.9 pCi/L: Moderate. EPA recommends considering mitigation, especially for long-term occupancy.
4.0 pCi/L and above: EPA action level. Mitigation is recommended. This is equivalent to the radiation exposure of 200 chest X-rays per year.
Above 8.0 pCi/L: High. Mitigation should be prioritized. The risk equivalent of smoking half a pack of cigarettes daily.

Radon mitigation is effective and typically costs between $800-$2,500 for most Long Island homes. A small investment that eliminates a serious health risk.

Frequently Asked Questions About Radon Testing on Long Island

Is radon really a problem on Long Island?

Yes. While Long Island is not in the EPA’s highest-risk zone, elevated radon has been found in homes across both Nassau and Suffolk County. Radon levels depend on local geology, home construction, and soil conditions — not just regional averages. The only way to know if your home is safe is to test it.

How much does radon testing cost on Long Island?

Professional radon testing with continuous monitors is affordably priced and can be bundled with a home inspection for additional savings. We provide upfront pricing with no hidden fees. Call (516) 591-3262 for a quote.

Can I do a radon test myself?

DIY charcoal canister kits are available but are significantly less accurate than professional continuous radon monitors. For real estate transactions, lenders and attorneys typically require professional testing. For the most reliable results — especially when making decisions about your family’s health — professional testing is worth the investment.

How long does radon testing take?

The testing period is a minimum of 48 hours. Our inspector places the monitor, returns to retrieve it after the testing period, and provides results typically within 24 hours of retrieval. The entire process takes about 3 days from start to finish.

What happens if my home has high radon levels?

If your home tests above 4.0 pCi/L, radon mitigation is recommended. The most common solution is a sub-slab depressurization system, which uses a fan and pipe to vent radon gas from beneath your foundation to the outside air. These systems are highly effective, reducing radon levels by up to 99%. We can connect you with qualified radon mitigation professionals in the Long Island area.

Schedule Your Radon Test Today

Radon is a serious but solvable problem. The first step is knowing where you stand. Buying, selling, or just protecting your family, professional radon testing gives you the information you need to make smart decisions.

📞 Call (516) 591-3262 to schedule your radon test on Long Island.

The Inspection Boys
47 West Main Street, Smithtown, NY 11787
Serving Nassau County, Suffolk County, Queens & Brooklyn
InterNACHI Certified | 200% Money-Back Guarantee