Marmarth, ND Radon Mitigation and Testing

Q: What EPA Radon Zone is Marmarth in?

Marmarth is in Slope County, EPA Zone 1.

Q: How much does radon mitigation cost in Marmarth?

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

Slope County

EPA Zone 1

Remote Slope County community Marmarth sits on the Fort Union Formation's lignite-bearing sedimentary rocks, which can produce variable radon levels across southwestern North Dakota's badlands region. The area's sparse housing includes both historic homesteads and newer ranch-style construction, many with partial basements or crawl spaces built to accommodate the challenging prairie conditions. Since radon testing data for zip code 58643 remains unavailable, residents should prioritize professional testing given North Dakota's classification as a high-radon-potential state.

Marmarth, ND Radon Mitigation

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

Marmarth, ND Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Marmarth Radon Facts

Key details about the radon risk profile for Marmarth and the 58643 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Slope County, ND

Zip Code

58643

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Marmarth and the 58643 zip code are located in Slope County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Marmarth, ND

What EPA Radon Zone is Marmarth in?

Marmarth and the 58643 zip code are in Slope 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 Marmarth?

Radon mitigation in Marmarth 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 Marmarth?

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 North Dakota

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Grand Forks	13.50 pCi/L	8
Grafton	7.67 pCi/L	3
Dickinson	6.00 pCi/L	3
Watford City	5.50 pCi/L	2
Bismarck	No submissions	0