Johnston, IA Radon Levels

Q: What is the average radon level in Johnston, IA?

Based on 1 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Johnston in?

Johnston is in Polk County, EPA Zone 1.

Q: How much does radon mitigation cost in Johnston?

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

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

Johnston, IA Radon Facts

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

County Polk County, IA

Zip Code 50131

Avg. User Level 5.00 pCi/L

User Tests 1

This Des Moines Metro suburb in Polk County shows an average radon level of 5.0 pCi/L, exceeding the EPA's 4.0 pCi/L action threshold. The community's glacial till soils over limestone bedrock, combined with typical full-basement construction in this 50131 zip code area, create conditions where radon can accumulate readily.

5.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Johnston, IA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Johnston, IA Radon Mitigation

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

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Johnston, Iowa Radon Levels

User-submitted radon test readings from homes in the Johnston area.

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Johnston, IA	21-50 Years	Full Basement	Jul 2018

Have a radon test result for Johnston? Submit your reading to help other homeowners.

Radon FAQ for Johnston, IA

What is the average radon level in Johnston, IA?

Based on 1 user-submitted test, the average radon level in Johnston is 5.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Johnston in?

Johnston and the 50131 zip code are in Polk 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.

How much does radon mitigation cost in Johnston?

Radon mitigation in Johnston 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 Johnston?

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.

Most Active Radon Markets in Iowa

Cities in Iowa with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Waterloo	8.50 pCi/L	4
Ames	9.67 pCi/L	3
Fairfield	14.00 pCi/L	2
Mount Pleasant	12.00 pCi/L	2
Ottumwa	5.50 pCi/L	2
Iowa City	7.00 pCi/L	1
Muscatine	No submissions	0