Seneca, SC Radon Mitigation and Testing

Q: What is the average radon level in Seneca, SC?

Based on 3 user-submitted tests, the average radon level is 10.30 pCi/L.

Q: What EPA Radon Zone is Seneca in?

Seneca is in Oconee County, EPA Zone 2.

Q: How much does radon mitigation cost in Seneca?

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

Avg: 10.30 pCi/L

Oconee County

EPA Zone 2

3 user tests

Seneca in Oconee County has recorded an average radon level of 10.33 pCi/L based on three tests, significantly exceeding the EPA action threshold of 4.0 pCi/L. Located in the Blue Ridge foothills where granite bedrock and uranium-bearing minerals create elevated radon potential, the community spans zip codes 29672 and 29678. The area's housing includes both historic downtown structures and newer developments, many with basements that can trap radon gas, making professional testing and mitigation essential for resident safety.

10.30

pCi/L average

Above EPA Action Level

Based on 3 user-submitted radon tests for homes in Seneca, SC. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Seneca, SC Radon Mitigation

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

Seneca, SC Radon Testing

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

Seneca, South Carolina Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Seneca, SC	0-20 Years	Full Basement	Feb 2024
5 pCi/L	Seneca, SC	0-20 Years	Full Basement	May 2020
20 pCi/L	Seneca, SC	0-20 Years	Full Basement	May 2018

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

Seneca Radon Facts

Key details about the radon risk profile for Seneca and the 29672 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Oconee County, SC

Zip Code

29672

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

10.30 pCi/L

User Tests Submitted

Seneca and the 29672 zip code are located in Oconee 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 Seneca, SC

What is the average radon level in Seneca, SC?

Based on 3 user-submitted tests, the average radon level in Seneca is 10.30 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 Seneca in?

Seneca and the 29672 zip code are in Oconee 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 Seneca?

Radon mitigation in Seneca 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 Seneca?

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 Carolina

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

City	Avg User Radon Level	Submissions
Fort Mill	6.00 pCi/L	1
Greenville	5.00 pCi/L	1