Spearfish, SD Radon Mitigation and Testing

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

Based on 4 user-submitted tests, the average radon level is 7.80 pCi/L.

Q: What EPA Radon Zone is Spearfish in?

Spearfish is in Lawrence County, EPA Zone 2.

Q: How much does radon mitigation cost in Spearfish?

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

Avg: 7.80 pCi/L

Lawrence County

EPA Zone 2

4 user tests

Positioned in Lawrence County near the northern Black Hills, Spearfish shows an average radon level of 7.75 pCi/L based on local testing data, which exceeds the EPA action threshold of 4.0 pCi/L. The area's unique geology, featuring limestone canyon formations and ancient sedimentary deposits, contributes to elevated radon concentrations throughout the region. Homes in this scenic college town, ranging from historic downtown properties to modern hillside developments, should prioritize radon testing and mitigation when necessary.

7.80

pCi/L average

Above EPA Action Level

Based on 4 user-submitted radon tests for homes in Spearfish, SD. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Spearfish, SD Radon Mitigation

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

Spearfish, SD Radon Testing

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

Spearfish, South Dakota Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Spearfish, SD	0-20 Years	Full Basement	Sep 2019
5 pCi/L	Spearfish, SD	21-50 Years	Full Basement	Dec 2018
12 pCi/L	Spearfish, SD	21-50 Years	Partial Basement	Mar 2018
8 pCi/L	Spearfish, SD	0-20 Years	—	May 2016

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

Spearfish Radon Facts

Key details about the radon risk profile for Spearfish and the 57783 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Lawrence County, SD

Zip Code

57783

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

7.80 pCi/L

User Tests Submitted

Spearfish and the 57783 zip code are located in Lawrence 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 Spearfish, SD

What is the average radon level in Spearfish, SD?

Based on 4 user-submitted tests, the average radon level in Spearfish is 7.80 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 Spearfish in?

Spearfish and the 57783 zip code are in Lawrence 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 Spearfish?

Radon mitigation in Spearfish 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 Spearfish?

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