Anoka County is one of the highest-radon counties in Minnesota. The Minnesota Department of Health estimates more than half of homes here test above the EPA action level of 4.0 pCi/L. Here's what the data shows — and what it means for your home.
Sources: Minnesota Department of Health Radon Program, EPA Map of Radon Zones, Dr. Dan Steck's Minnesota Radon Project. See our methodology for full sourcing.
Click any city below to see local data, recent test results, and how the housing stock shapes radon risk in that neighborhood.
Zoomed view of the main map, bounded to Anoka County. Each city polygon links to its hub.
Anoka County sits on a complex of glacial outwash deposits left by the retreating Wisconsin glaciation roughly 12,000 years ago. The county is dominated by the Anoka Sand Plain — a porous, well-drained substrate that lets radon migrate easily from the underlying bedrock into the soil gas above.
The bedrock itself — primarily the Prairie du Chien dolomite and St. Peter sandstone — contains uranium-bearing minerals that decay into radon over geologic time. The combination of radon-producing bedrock and a permeable overburden is the worst possible setup for indoor radon. The same gas that disperses harmlessly outdoors gets trapped and accumulates in basements.
Housing stock compounds the problem. Roughly 80% of Anoka County homes have basements — many of them finished — and a meaningful share were built between 1960 and 1990, before modern radon-resistant construction techniques. Finished basements with substantial below-grade living space are precisely where radon accumulates most.
If you live in Anoka County and haven't tested in the last two years — or have never tested — your home statistically more likely than not sits above the EPA action level. This isn't a fear claim; it's just what the data says.
Testing is the only way to know your number. Most homes that test high can be mitigated for $1,200–$2,000, dropping levels to under 2.0 pCi/L.
Local data for every city we test in Anoka County. Click into a city to see ZIP-level test results, geology, and housing stock specific to that area.
A 30-minute walkthrough of your home with Hunter. Floor plan, basement use, ventilation, prior mitigation history. This shapes where the monitor goes.
Lab-grade Sun Nuclear or RadonEye Pro monitor, placed in the lowest livable area per AARST protocols. Hourly readings, not a passive average.
In-person results delivery within 72 hours. Your number, what it means, and a clear recommendation: monitor, mitigate, or no action needed.
Hunter is certified by the National Radon Proficiency Program (NRPP) as a Radon Measurement Specialist. The continuous monitors we use are calibrated annually and meet AARST measurement protocols.
Under Minnesota's Radon Awareness Act (2014), sellers must disclose radon test results and the dates they were performed. If you're listing a home in Anoka County, a current test is essentially table stakes — and given the county's elevated radon profile, buyers will likely ask.
If you're buying, request the seller's test results during the inspection contingency window. If no test exists, you can either request one as part of the deal or order an independent test before closing.
Read the full real estate guide| Scenario | What to do |
|---|---|
| Listing your home | Test now. Mitigate if above 4.0. Disclose results. |
| Reviewing a seller's disclosure | Check test date — older than 2 years is stale. |
| No test on file | Request one. ~$200, results in 72 hours. |
| Test above 4.0 | Mitigation can be negotiated into the deal. |
Yes, on average. Northern Anoka cities — Andover, Ham Lake, East Bethel, Oak Grove — sit on the most permeable section of the Anoka Sand Plain, which lets soil gas migrate more freely. Southern Anoka (Columbia Heights, Fridley) tends to test slightly lower, though still well above the EPA action level on average.
Yes. Radon levels can vary dramatically between adjacent homes depending on foundation type, ventilation, basement use, and soil contact. The only valid result for your home is a test of your home.
Every two years for occupied homes, more often if you've recently renovated, finished a basement, changed your HVAC system, or had any foundation work. The EPA also recommends testing immediately if your last test was more than five years ago.
Most Anoka County homes mitigate with a sub-slab depressurization system for $1,200–$2,000 depending on home size and foundation complexity. We don't perform mitigation ourselves — we refer to two Anoka-area contractors we trust and have audited.
Often higher. Closed windows, lower stack effect, and concentrated indoor air make winter tests trend higher than summer tests in Minnesota. For real estate disclosure, the EPA prefers tests under "closed-house conditions" — which is naturally easier in winter but achievable year-round.
More accurate isn't quite the right word — both can be accurate when used correctly. But continuous monitors give you hourly data, drift detection, and tamper alerts. A charcoal kit gives you a single average number, sent to a lab two weeks later. For a high-stakes decision like "do I mitigate," continuous monitoring is the appropriate tool.
Two days. One monitor. A clear answer. Hunter's House Radon serves all of Anoka County.
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