Columbus, WI Radon Levels

Q: What EPA Radon Zone is Columbus in?

Columbus is in Columbia County, EPA Zone 2.

Q: How much does radon mitigation cost in Columbus?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Columbus radon levels and find certified testing and mitigation professionals to keep your home safe

Columbus, WI Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Columbia County, WI

Zip Code 53925

Nestled in Columbia County within the Madison Metro area, this Wisconsin community sits in EPA Zone 2 where moderate radon potential exists. While specific testing data for zip code 53925 remains limited, the region's glacial soils over bedrock can create variable radon conditions. Homeowners should conduct professional testing, particularly in properties with basements or lower-level living spaces.

7.25

pCi/L area average

Above EPA Action Level

Columbia County average: 7.25 pCi/L, based on 4 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Columbus itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Columbus, WI Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Columbus, WI

No homeowner tests have been submitted for Columbus yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Fall River	5.1 mi	10.00 pCi/L	1
Beaver Dam	13.0 mi	10.00 pCi/L	1
Arlington	16.9 mi	6.00 pCi/L	1
Watertown	17.0 mi	7.00 pCi/L	1
Juneau	17.5 mi	4.00 pCi/L	1
Pardeeville	20.5 mi	4.00 pCi/L	1
Waunakee	23.8 mi	5.50 pCi/L	2
Mc Farland	25.9 mi	9.00 pCi/L	1

Columbia County Radon Profile

EPA mapping assigns Columbia County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 4 cities in Columbia County average 7.25 pCi/L across 4 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Columbia County home regardless of zone or a neighbor's results.

Radon FAQ for Columbus, WI

What EPA Radon Zone is Columbus in?

Columbus and the 53925 zip code are in Columbia County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Columbus?

No homeowner radon tests have been submitted for Columbus yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Columbia County average—are the best available indicator of local conditions until Columbus homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Columbus?

Radon mitigation in Columbus typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Columbus?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.