Porthill, ID Radon Levels

Q: What EPA Radon Zone is Porthill in?

Porthill is in Boundary County, EPA Zone 1.

Q: How much does radon mitigation cost in Porthill?

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

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

Porthill, ID Radon Facts

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

County Boundary County, ID

Zip Code 83853

Situated in Boundary County near the Canadian border, Porthill represents a small mountain community where radon testing data remains limited. Given Idaho's granite-rich geology and the presence of uranium-bearing minerals throughout the northern panhandle region, homeowners in zip code 83853 should prioritize radon testing. Regular testing helps ensure indoor air quality in this scenic but geologically complex area.

Porthill, ID Radon Mitigation

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

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Radon FAQ for Porthill, ID

What EPA Radon Zone is Porthill in?

Porthill and the 83853 zip code are in Boundary 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 Porthill?

Radon mitigation in Porthill 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 Porthill?

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 Idaho

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

City	Avg User Radon Level	Submissions
Idaho Falls	7.29 pCi/L	7
Hailey	7.83 pCi/L	6
Post Falls	9.00 pCi/L	5
Coeur D Alene	9.00 pCi/L	4
Moscow	7.75 pCi/L	4
Victor	6.67 pCi/L	3
Driggs	16.00 pCi/L	2
Hayden	8.50 pCi/L	2
Pocatello	8.50 pCi/L	2
Eagle	6.00 pCi/L	1