What Is the Average Radon Level in Dakota County?
Quick answer: Dakota County is an EPA Radon Zone 1 county, meaning the predicted average indoor radon is the highest tier — above 4.0 pCi/L. The Minnesota Department of Health reports that roughly 2 in 5 Minnesota homes test above the 4.0 pCi/L action level, and Dakota County's geology puts it among the higher-risk areas. Because radon varies house to house, an average can't tell you your home's level — only a 48-hour test in your specific home can.
What "Zone 1" actually means
The EPA maps every U.S. county into one of three radon zones based on predicted average indoor levels. Zone 1 is the highest, with a predicted average above 4.0 pCi/L — the action level. Dakota County, including Burnsville, falls in Zone 1. That doesn't mean every home is elevated; it means the geology makes elevated readings common enough that testing is strongly warranted.
| EPA Zone | Predicted average indoor radon | Dakota County |
|---|---|---|
| Zone 1 | Above 4.0 pCi/L (highest) | ✓ This is Dakota County |
| Zone 2 | 2.0 – 4.0 pCi/L (moderate) | — |
| Zone 3 | Below 2.0 pCi/L (lowest) | — |
Minnesota is a high-radon state
Per the Minnesota Department of Health, about 2 in 5 homes statewide test above the 4.0 pCi/L action level — one of the highest rates in the nation. The cause is glacial geology and uranium-bearing soils that release radon gas, which then accumulates in basements and lower levels under closed-house winter conditions. Dakota County's deposits place it firmly in the elevated group.
Why an average can't decide for you
Radon is intensely local — two neighboring Burnsville homes can test very differently based on soil, foundation, and ventilation. A county average is useful for risk awareness but useless for your specific decision. The only number that matters is the one from a continuous monitor placed in your home's lowest livable level for 48 hours. See is radon testing worth it in Burnsville.
A real Burnsville example
Two buyers on the same Burnsville cul-de-sac compared notes. One 1986 home tested at 2.3 pCi/L — below the action level. The home across the street, same era and builder, tested at 6.8 pCi/L and needed mitigation. Same neighborhood, same Zone 1 average, very different results. Neither buyer could have known without testing their own home, and the second negotiated a seller-funded mitigation system on the strength of the documented reading.
If your home tests high
An elevated reading is a manageable, well-understood fix: active sub-slab depressurization vents radon from beneath the slab to above the roofline, routinely bringing levels well under 2.0 pCi/L. On a purchase it is commonly negotiated as a seller-funded repair.