The honest truth: if you're buying a home in Apple Valley, Burnsville, Lakeville, or anywhere in Dakota County, your basement probably has elevated radon. Minnesota has the highest residential radon levels in the United States — and Dakota County is in the high-risk zone. Here's what every south-metro buyer needs to know.
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Free Instant Estimate →Why Minnesota leads the country in radon
Minnesota's geology is a perfect radon factory. Retreating glaciers left behind till and bedrock containing trace uranium. As the uranium decays — over thousands of years — it produces radon gas. The gas migrates up through soil and rock and concentrates in basements and crawlspaces.
Modern airtight homes make it worse. The same energy-efficient construction that lowers your heating bill traps radon inside. Older drafty homes actually have lower indoor radon levels because the gas can escape.
Dakota County is in the high-risk zone
The Minnesota Department of Health classifies counties by radon risk. Dakota County is Zone 1 — the highest risk category. The MDH estimates that more than 2 in 5 homes in Dakota County exceed the EPA action level of 4.0 pCi/L.
From our 3,000+ inspections across Apple Valley, Burnsville, Lakeville, Rosemount, Eagan, Farmington, Prior Lake, and Savage — about half the homes we test exceed action levels. Some test in the 10-20+ pCi/L range, which is 2.5-5x the action threshold.
The cancer risk is real
The EPA classifies radon as the second-leading cause of lung cancer in the United States after smoking — and the #1 cause among non-smokers. Approximately 21,000 lung cancer deaths per year in the U.S. are radon-related.
The risk is cumulative. A home that tests at 8 pCi/L (twice action level) over 20 years of occupancy carries roughly the same lung cancer risk as smoking half a pack of cigarettes a day for that period. Most people don't think about it because there are no immediate symptoms — but the long-term math is real.
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Free Instant Estimate →How radon testing works during your inspection
Step 1 — Setup (10 minutes)
We place a continuous radon monitor in the lowest livable level of the home — typically a basement or first-floor bedroom in a slab-on-grade home. The monitor records hourly readings for the duration of the test.
Step 2 — 48-hour minimum test
The home must remain in "closed-house" conditions during the test (windows and doors closed except for normal entry/exit). The monitor logs readings every hour to capture daily variation.
Step 3 — Pickup & results
We return after 48 hours, retrieve the monitor, and deliver results within 24 hours. The report includes the average reading, hourly chart, and a plain-English explanation of what the number means.
What the numbers mean
| Radon level (pCi/L) | What it means | Recommended action |
|---|---|---|
| Below 2.0 | Low | Retest every 2-5 years |
| 2.0 – 3.9 | Elevated but below EPA action level | Consider mitigation; monitor |
| 4.0 – 9.9 | EPA action level — mitigation recommended | Negotiate mitigation with seller |
| 10.0+ | High — mitigate before occupancy | Required action item |
If your radon is high — what happens next
High radon is not a deal-killer. It's a negotiation point.
Radon mitigation systems work and they're affordable. A typical Dakota County mitigation install runs $1,200–$2,000 — sub-slab depressurization with a fan that vents radon out the roof. Properly installed systems reduce indoor radon by 50-99%.
Standard practice in Apple Valley real estate transactions: if the test exceeds 4.0 pCi/L, buyers ask sellers to either install mitigation before closing OR provide a credit for the buyer to install post-closing. Most sellers agree because they know the next buyer will ask for the same thing.
We don't sell mitigation — no conflict of interest. We just deliver the test results and refer you to trusted local installers.
Cities we test most often
- Apple Valley — Cobblestone Lake area, Diamond Path, Greenleaf — high concentration of basement homes
- Burnsville — older walkouts and split-levels almost always test elevated
- Lakeville — even new construction in Spirit of Brandtjen Farm tests high
- Eagan — Lebanon Hills walkouts particularly susceptible
- Rosemount — Bloomfield and Glendalough new builds + older farmhouses
Common questions
"Won't a radon test be inaccurate if I do it in summer?" Properly conducted closed-house tests are accurate year-round. EPA protocol requires closed-house conditions which neutralize seasonal variation.
"Should I test even if the seller says they had it tested last year?" Yes. Radon levels can shift due to seasonal variation, soil saturation, foundation movement, and HVAC changes. Always do your own test.
"What if the home already has a mitigation system?" Test anyway. We verify the system is working and reducing radon to safe levels. Failed mitigation systems are common.
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