Rio, WI Radon Levels

Q: What EPA Radon Zone is Rio in?

Rio is in Columbia County, EPA Zone 2.

Q: Why are radon readings shown from areas near Rio?

No homeowner radon tests have been submitted for Rio yet, so readings from the closest cities and the Columbia County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in Rio?

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

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

Rio, WI Radon Facts

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

County Columbia County, WI

Zip Code 53960

Located in Columbia County within the Madison Metro area, Rio sits atop glacial terrain and underlying Paleozoic bedrock that can produce moderate to elevated radon levels. Testing data for zip code 53960 remains limited, making individual home assessment essential for residents. The EPA Zone 2 classification reflects moderate radon potential typical of south-central Wisconsin's geological conditions.

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 Rio 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+

Rio, 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 Rio, WI

No homeowner tests have been submitted for Rio 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	8.8 mi	10.00 pCi/L	1
Pardeeville	8.9 mi	4.00 pCi/L	1
Arlington	9.2 mi	6.00 pCi/L	1
Portage	14.7 mi	9.00 pCi/L	1
Waunakee	19.9 mi	5.50 pCi/L	2
Beaver Dam	20.0 mi	10.00 pCi/L	1
Middleton	25.9 mi	4.00 pCi/L	1
Juneau	27.8 mi	4.00 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 Rio, WI

What EPA Radon Zone is Rio in?

Rio and the 53960 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 Rio?

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

Radon mitigation in Rio 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 Rio?

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.