Is radon high in Douglas County, Wisconsin?

Low. The model predicts a long-term basement average of 1.5 pCi/L in Douglas County (about 18% below the US average of 1.8 and about 26% below the Wisconsin average of 2.0). That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Ranked 70 of 72 Wisconsin counties.

Should I test for radon in Douglas County?

Yes, once. The EPA recommends testing every home regardless of area, and the model's ZIP-level predictions in Douglas County already range from 1.3 to 1.9 pCi/L. A short-term kit costs little and settles the question for your house.

What does EPA Radon Zone 2 mean for Douglas County?

Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and classifies whole counties. The newer model's predicted average of 1.5 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

How much does radon mitigation cost in Douglas County?

A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; Wisconsin quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

Radon levels in Douglas County, Wisconsin

LowEPA Zone 2

Predicted long-term basement average of 1.5 pCi/L (model estimate) across 9 ZIP codes - about 18% below the US average of 1.8, about 26% below the Wisconsin average of 2.0. Ranked #70 of 72 Wisconsin counties.

Test Douglas County, WI once anyway - radon varies house to house

The predicted basement average here is 1.5 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

Get a short-term test kit →Or track it with a continuous monitor

We may earn a commission from Amazon at no extra cost to you.

Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

1.5 ± 0.07

pCi/L predicted basement mean (model SD)

0.9 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.3-1.9

range of ZIP-level basement predictions in the county

What this means for Douglas

The typical Douglas County home is predicted below 2 pCi/L, the lowest band. That is the best case an area can show - but it describes the average house, and the ZIP-level predictions within the county still span 1.3 to 1.9 pCi/L.

Note that the EPA classifies Douglas County as Zone 2 while the newer model predicts 1.5 pCi/L. The zone map predates two decades of test data; where they disagree, we grade on the model but show both. County figures weight each ZIP by its 2010 Census population, so they describe where people live rather than empty land.

Comparable Wisconsin counties: Ozaukee County (1.5), Sheboygan County (1.5), Ashland County (1.5), Manitowoc County (1.6). The state's highest is Lafayette County at 3.4 pCi/L.

ZIP codes in Douglas County

Predicted basement and upstairs means by ZIP (model estimate). ZIPs whose land is mostly in this county.

ZIP	Basement	Upstairs	Grade
54880	1.3 ± 0.08	0.9	Low
54874	1.8 ± 0.05	1.3	Low
54873	1.8 ± 0.06	1.0	Low
54849	1.9 ± 0.06	1.2	Low
54864	1.9 ± 0.05	1.1	Low
54838	1.8 ± 0.05	1.0	Low
54836	1.8 ± 0.06	1.1	Low
54854	1.8 ± 0.06	1.0	Low
54820	1.8 ± 0.05	1.0	Low

If your test comes back at 4 pCi/L or higher

Mitigation is a routine job: a fan-driven pipe that vents soil gas from under the slab to above the roofline, typically $800-$2,500 installed (typical range; local quotes vary). Use certified professionals: EPA find-a-professional. Read the full mitigation guide.

Douglas County radon questions

Is radon high in Douglas County, Wisconsin?: Low. The model predicts a long-term basement average of 1.5 pCi/L in Douglas County (about 18% below the US average of 1.8 and about 26% below the Wisconsin average of 2.0). That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Ranked 70 of 72 Wisconsin counties.
Should I test for radon in Douglas County?: Yes, once. The EPA recommends testing every home regardless of area, and the model's ZIP-level predictions in Douglas County already range from 1.3 to 1.9 pCi/L. A short-term kit costs little and settles the question for your house.
What does EPA Radon Zone 2 mean for Douglas County?: Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and classifies whole counties. The newer model's predicted average of 1.5 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.
How much does radon mitigation cost in Douglas County?: A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; Wisconsin quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

← All Wisconsin counties · How to test · Radon in a home sale · Methodology