Sullivan, WI Radon Levels

Q: What EPA Radon Zone is Sullivan in?

Sullivan is in Jefferson County, EPA Zone 1.

Q: How much does radon mitigation cost in Sullivan?

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

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

Sullivan, WI Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Jefferson County, WI

Zip Code 53178

This small Jefferson County community sits in Wisconsin's EPA Zone 1, where glacial deposits over sedimentary bedrock create high radon potential throughout the region. Testing data for Sullivan (53178) remains sparse, making professional radon testing essential for area homeowners. Many local homes feature full basements typical of Wisconsin construction, which can trap radon gas from soil beneath foundations.

7.00

pCi/L area average

Above EPA Action Level

Jefferson County average: 7.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Sullivan 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+

Sullivan, 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 Sullivan, WI

No homeowner tests have been submitted for Sullivan yet, so the closest user-submitted readings from neighboring communities are shown below. Radon varies by home — testing is the only way to know your level.

Radon Level	City	Distance	Home Age	Foundation	Submitted
5 pCi/L	Waukesha, WI	17.2 mi	0-20 Years	Partial Basement	Aug 2019
6 pCi/L	Waukesha, WI	17.2 mi	0-20 Years	Full Basement	Apr 2017
7 pCi/L	Watertown, WI	17.3 mi	21-50 Years	Full Basement	May 2018
10 pCi/L	Pewaukee, WI	17.6 mi	0-20 Years	Full Basement	Jul 2022
5 pCi/L	Elkhorn, WI	20.7 mi	51-99 Years	Full Basement	Dec 2018
7 pCi/L	Milton, WI	23.3 mi	0-20 Years	Full Basement	Jul 2021
16 pCi/L	Milton, WI	23.3 mi	0-20 Years	Full Basement	Jul 2017
6 pCi/L	Delavan, WI	26.0 mi	21-50 Years	Partial Basement	Sep 2022

Readings are drawn from the nearest cities with submitted data. Have a result for Sullivan? Submit your reading to help your neighbors.

Jefferson County Radon Profile

The bedrock and soils beneath Jefferson County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 1 city in Jefferson County average 7.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Jefferson County.

Radon FAQ for Sullivan, WI

What EPA Radon Zone is Sullivan in?

Sullivan and the 53178 zip code are in Jefferson County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

Why are radon readings shown from areas near Sullivan?

No homeowner radon tests have been submitted for Sullivan yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Jefferson County average—are the best available indicator of local conditions until Sullivan 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 Sullivan?

Radon mitigation in Sullivan 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 Sullivan?

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.

Radon Levels Near Sullivan, WI

User-submitted radon levels from the cities closest to Sullivan with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
Waukesha	17.2 mi	5.50 pCi/L	2
Watertown	17.3 mi	7.00 pCi/L	1
Pewaukee	17.6 mi	10.00 pCi/L	1
Elkhorn	20.7 mi	5.00 pCi/L	1
Milton	23.3 mi	11.50 pCi/L	2