South County Radon Testing & Mitigation | Webster Groves, Kirkwood, Crestwood

South County Radon

⚠️ The EPA estimates 1 in 15 U.S. homes has elevated radon — and Missouri homes are at higher risk. Learn why.

South County’s Radon Experts

Protect Your Home & Family From Elevated Radon Levels

Professional radon testing and mitigation serving Webster Groves, Kirkwood, Crestwood, Affton, and Sunset Hills. Fast results. Licensed contractors. Peace of mind.

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✓ Licensed & Insured Contractors

✓ Results in 48–72 Hours

✓ Serving South County Since Day One

The Risk Is Real

Radon Is the #2 Cause of Lung Cancer in the U.S.

It’s colorless, odorless, and invisible — which is why most homeowners have no idea it’s there.

21,000

Americans die from radon-related lung cancer each year (EPA estimate)

1 in 15

U.S. homes have radon levels at or above the EPA action level

4 pCi/L

EPA action level — mitigation is recommended above this threshold

99%

Reduction in radon levels with a properly installed mitigation system

What Is Radon?

Radon is a naturally occurring radioactive gas produced by the breakdown of uranium in soil and rock. It seeps up through the ground and can accumulate to dangerous levels inside homes — especially in basements and lower floors. Because you can’t see, smell, or taste it, the only way to know your exposure level is to test.

Why South County Homes Are at Risk

Missouri’s geology — particularly the St. Louis area — contains uranium-bearing soils that produce radon naturally. Older homes in Webster Groves, Kirkwood, and surrounding areas often have foundation gaps, crawl spaces, and construction styles that allow radon to enter easily. The EPA maps much of St. Louis County as Zone 1 — the highest risk category.

What We Do

Radon Services for South County Homes

From initial testing to full mitigation, we connect you with licensed local contractors who get it done right.

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Radon Testing

Short-term and long-term radon testing with certified professionals. Get accurate results within 48–72 hours. Required by many lenders and recommended before any home sale.

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Radon Mitigation

Sub-slab depressurization systems installed by licensed contractors. Most installs are completed in a single day. Guaranteed to reduce your radon level below EPA action thresholds.

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Real Estate Inspections

Buying or selling a home in South County? Radon testing is a critical part of the inspection process. We provide fast turnaround results that satisfy real estate transaction timelines.

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Your Neighborhood

We Know South County

Every city has its own housing stock, geology, and foundation types. We work with local contractors who know your neighborhood — not a call center three states away.

Webster Groves

Older craftsman and colonial homes with basements — a common entry point for radon gas.

Kirkwood

Historic housing stock with varied foundation types. Radon levels can vary block by block.

Crestwood

Mid-century ranch and split-level homes — slab and basement configurations both common.

Affton

Post-war construction with crawl spaces and older concrete — elevated radon risk areas.

Sunset Hills

Newer construction doesn’t mean lower radon. Many Sunset Hills homes still test high.

Simple Process

How It Works

Getting your home tested is easier than you think. Here’s what to expect.

Call Us

Tell us your address and what you need. We’ll match you with a licensed local contractor same day.

Test Is Scheduled

A short-term test device is placed in your home. No disruption. No mess. Usually takes 48–72 hours.

Get Your Results

You receive a clear written report with your radon level and whether action is recommended by the EPA.

Mitigate if Needed

If levels are high, we schedule mitigation. Most systems are installed in 4–6 hours and last 10+ years.

Common Questions

Frequently Asked Questions

How much does radon testing cost?

Professional short-term radon tests typically range from $100–$175 in the St. Louis area. For real estate transactions, tests are often ordered at the buyer’s request as part of the inspection period.

How long does a radon test take?

Short-term tests run 48–72 hours. During the test, windows and exterior doors should remain closed (except for normal entry/exit). You’ll have written results shortly after the device is retrieved.

What if my radon level is high?

The EPA recommends mitigation if your home tests at 4 pCi/L or higher. A sub-slab depressurization system (the most common fix) typically costs $800–$1,500 and can reduce radon levels by up to 99%.

Do I need a radon test when buying a home?

It’s strongly recommended — and many real estate agents in South County now include it as a standard part of the inspection process. Some mortgage lenders require it. It’s a small cost compared to long-term health risk.

Is radon a problem in new construction?

Yes. Radon comes from the soil beneath the home, not the age of the building. Newer homes can still have elevated levels — especially if they lack radon-resistant new construction features.

Are your contractors licensed?

Yes. We only work with contractors who are licensed, insured, and certified through the Missouri Department of Health and Senior Services (or NRPP/NRSB certified testers).

Coverage Area

Areas We Serve

We serve homeowners, buyers, sellers, and real estate professionals throughout South St. Louis County and surrounding areas.

Webster Groves Kirkwood Crestwood Affton Sunset Hills Glendale Shrewsbury Maplewood Mehlville Oakville Fenton Arnold Lemay South St. Louis City

Ready to Test Your Home?

Get matched with a licensed local contractor today. Most tests scheduled within 24 hours.

📞 Call Now — It’s Free to Get a Quote