Randolph, WI Radon Levels

Q: What EPA Radon Zone is Randolph in?

Randolph is in Columbia County, EPA Zone 2.

Q: How much does radon mitigation cost in Randolph?

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

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

Randolph, WI Radon Facts

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

County Columbia County, WI

Zip Code 53956

Located in Columbia County within the Madison Metro area, Randolph sits on glacial deposits over sedimentary bedrock that contributes to Wisconsin's elevated radon potential. The community's housing stock includes rural farmsteads and suburban-style homes, many with full basements typical of Wisconsin construction. Given the absence of local testing data for zip code 53956, residents should conduct radon testing to establish their baseline exposure levels.

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 Randolph 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+

Randolph, 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 Randolph, WI

No homeowner tests have been submitted for Randolph 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
Beaver Dam	9.8 mi	10.00 pCi/L	1
Fall River	10.1 mi	10.00 pCi/L	1
Pardeeville	16.2 mi	4.00 pCi/L	1
Juneau	19.4 mi	4.00 pCi/L	1
Green Lake	21.1 mi	6.00 pCi/L	1
Arlington	23.3 mi	6.00 pCi/L	1
Portage	23.5 mi	9.00 pCi/L	1
Watertown	25.5 mi	7.00 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 Randolph, WI

What EPA Radon Zone is Randolph in?

Randolph and the 53956 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 Randolph?

No homeowner radon tests have been submitted for Randolph 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 Randolph 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 Randolph?

Radon mitigation in Randolph 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 Randolph?

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.