Custer, SD Radon Mitigation and Testing

Q: What is the average radon level in Custer, SD?

Based on 1 user-submitted tests, the average radon level is 20.00 pCi/L.

Q: What EPA Radon Zone is Custer in?

Custer is in Custer County, EPA Zone 2.

Q: How much does radon mitigation cost in Custer?

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

Avg: 20.00 pCi/L

Custer County

EPA Zone 2

1 user test

Nestled in Custer County within the Rapid City Metro area near the Black Hills, Custer shows significantly elevated radon levels with an average of 20.0 pCi/L, far exceeding the EPA action threshold. This 57730 community sits on Precambrian granite and metamorphic rocks that are known radon producers in the Black Hills region. All residents should prioritize immediate radon testing and mitigation due to the area's exceptionally high radon potential.

20.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Custer, SD Radon Mitigation

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

Custer, SD Radon Testing

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

Custer, South Dakota Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
20 pCi/L	Custer, SD	0-20 Years	Full Basement	Apr 2025

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

Custer Radon Facts

Key details about the radon risk profile for Custer and the 57730 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Custer County, SD

Zip Code

57730

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

20.00 pCi/L

User Tests Submitted

Custer and the 57730 zip code are located in Custer County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Custer, SD

What is the average radon level in Custer, SD?

Based on 1 user-submitted test, the average radon level in Custer is 20.00 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 Custer in?

Custer and the 57730 zip code are in Custer 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 Custer?

Radon mitigation in Custer 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 Custer?

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

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