Webster, SD Radon Levels

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

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

Q: What EPA Radon Zone is Webster in?

Webster is in Day County, EPA Zone 1.

Q: How much does radon mitigation cost in Webster?

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

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

Webster, SD Radon Facts

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

County Day County, SD

Zip Code 57274

Avg. User Level 20.00 pCi/L

User Tests 1

Located in northeastern Day County, Webster recorded an extremely elevated radon level of 20.0 pCi/L, five times above the EPA action threshold. This reading from South Dakota's glacial prairie region highlights the significant radon potential in zip code 57274, where many homes feature full basements. Given this concerning data point, all area residents should prioritize immediate professional radon testing and mitigation consultation.

20.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Webster, SD Radon Mitigation

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Webster, SD Radon Levels

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

Radon Level	City	Home Age	Foundation
20 pCi/L	Webster, SD	0-20 Years	Full Basement

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

Radon FAQ for Webster, SD

What is the average radon level in Webster, SD?

Based on 1 user-submitted test, the average radon level in Webster 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 Webster in?

Webster and the 57274 zip code are in Day 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 Webster?

Radon mitigation in Webster 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 Webster?

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

Webster, SD Radon Levels

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

Webster, SD Radon Facts

Webster, SD Radon Mitigation

Need Radon Mitigation or Testing in Webster?

Webster, SD Radon Levels

Radon FAQ for Webster, SD

Most Active Radon Markets in South Dakota

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