Minnesota · county radon data
Radon in Anoka County, Minnesota
17.4% of the 4,520 home radon tests on record here reached the EPA action level — toward the lower end of the state's tested counties, ranked #86 of 87 tested Minnesota counties.
What the numbers say
Anoka County sits 38.5 points below the Minnesota median (55.9% of tests over the limit across the state's counties). The median reading among its 4,520 reported tests was 1.9 pCi/L — and the single highest test on record reached 32.6 pCi/L. EPA maps place the county in Radon Zone 2 — moderate predicted potential (2–4 pCi/L average screening levels), which still produces plenty of homes over the limit.
Why: the ground under Anoka County
Blanketed by clay-rich glacial till carrying ground-up uranium-bearing rock — the geologic reason nearly all of Minnesota is EPA Zone 1 and the state's average indoor radon runs roughly triple the national average. Long heating seasons in tight houses compound what the ground supplies.
Geology sources: MN Dept of Health · USGS WRI 98-4169.
The housing stock factor
The median Anoka County home dates to 1986 — decades before radon-resistant new construction entered building codes. With 370,349 residents largely housed in that older stock, testing is the only way any individual household knows where it stands.
ZIP codes in Anoka County
Minnesota doesn't publish ZIP-level test results, so these ZIPs share the county figures above — the roster is here so you can confirm your address is covered by this data.
| ZIP | Place |
|---|---|
| 55005 | Bethel |
| 55011 | Cedar |
| 55014 | Circle Pines |
| 55025 | Forest Lake |
| 55070 | Saint Francis |
| 55092 | Wyoming |
| 55303 | Anoka |
| 55304 | Andover |
| 55421 | Minneapolis |
| 55432 | Minneapolis |
| 55433 | Minneapolis |
| 55434 | Minneapolis |
| 55448 | Minneapolis |
| 55449 | Minneapolis |
Anoka County in the Minnesota picture
| Anoka County | 17.4% over the limit | 4,520 tests |
| Minnesota's highest: Rock County | 83.8% | 138 tests |
| Minnesota county median | 55.9% | 87 counties ranked |
| Share of all Minnesota tests from this county | 5.0% | |
Ranked nearby in Minnesota
- St. Louis County — #83, 23.7% of 3,010 tests over the limit
- Lake County — #84, 21.8% of 147 tests over the limit
- Isanti County — #85, 18.6% of 343 tests over the limit
- Lake of the Woods County — #87, 14.3% of 6 tests over the limit
(Ranking neighbors — counties adjacent in the Minnesota test ranking, not necessarily on the map.)
High test? Fixes and real pricing: the Minnesota mitigation cost guide. Every statistic here traces to the methodology (CDC EPHT (labs), 2008–2017; zones: EPA; year built & population: ACS 5-year).
Anoka County radon FAQ
- Is radon high in Anoka County?
- 17.4% of 4,520 home tests reported to the CDC came back at or above the EPA action level of 4 pCi/L — 38.5 points below the Minnesota county median of 55.9%, ranking #86 of 87 tested counties. EPA classifies the county as Zone 2.
- Does an older home in Anoka County mean more radon risk?
- The county's median home was built in 1986 — before radon-resistant construction practices entered building codes in the 1990s, so most of the housing stock has no built-in radon protection. Construction age changes the odds, not the answer: only a test tells you about your house.
- Where do these Anoka County numbers come from?
- 4,520 aggregated home tests in the CDC's Environmental Public Health Tracking dataset (CDC EPHT 2008-2017). Median reading: 1.9 pCi/L; the highest recorded test hit 32.6 pCi/L. How we handle the data, including its limits, is documented on our methodology page.
- What's the highest radon reading recorded in Anoka County?
- 32.6 pCi/L — 8× the EPA action level — against a county median of 1.9 pCi/L across 4,520 tests. That spread is the point: neighboring homes routinely test wildly differently.