Fairfax, SD Radon Levels

Q: What EPA Radon Zone is Fairfax in?

Fairfax is in Gregory County, EPA Zone 2.

Q: How much does radon mitigation cost in Fairfax?

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

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

Fairfax, SD Radon Facts

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

County Gregory County, SD

Zip Code 57335

This Gregory County community in south-central South Dakota sits where Pierre Shale formations can contribute to moderate radon conditions across the region. Although specific testing data for Fairfax is limited, South Dakota's generally elevated radon potential statewide makes individual home testing important. Residents of zip code 57335 should consider professional radon testing, particularly in properties with basements or lower-level areas.

Fairfax, SD 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 Fairfax, SD

What EPA Radon Zone is Fairfax in?

Fairfax and the 57335 zip code are in Gregory 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.

How much does radon mitigation cost in Fairfax?

Radon mitigation in Fairfax 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 Fairfax?

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 South Dakota

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

City	Avg User Radon Level	Submissions
Spearfish	7.75 pCi/L	4
Rapid City	10.50 pCi/L	2
Aberdeen	8.50 pCi/L	2
Sioux Falls	6.00 pCi/L	2
Watertown	6.00 pCi/L	2