Lewes, DE Radon Mitigation and Testing

Q: What is the average radon level in Lewes, DE?

Based on 1 user-submitted tests, the average radon level is 6.00 pCi/L.

Q: What EPA Radon Zone is Lewes in?

Lewes is in Sussex County, EPA Zone 3.

Q: How much does radon mitigation cost in Lewes?

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

Avg: 6.00 pCi/L

Sussex County

EPA Zone 3

1 user test

Positioned in Sussex County along Delaware's Atlantic coast, Lewes has recorded an average radon level of 6.0 pCi/L, which exceeds the EPA's 4.0 pCi/L action threshold. The coastal location and underlying geology contribute to elevated radon potential in zip code 19958. Residents should prioritize radon testing and mitigation, as even homes near the ocean can experience significant radon accumulation in enclosed spaces.

6.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Lewes, DE Radon Mitigation

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

Lewes, DE Radon Testing

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

Lewes, Delaware Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Lewes, DE	0-20 Years	Full Basement	Oct 2024

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

Lewes Radon Facts

Key details about the radon risk profile for Lewes and the 19958 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Sussex County, DE

Zip Code

19958

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

6.00 pCi/L

User Tests Submitted

Lewes and the 19958 zip code are located in Sussex County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Lewes, DE

What is the average radon level in Lewes, DE?

Based on 1 user-submitted test, the average radon level in Lewes is 6.00 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 Lewes in?

Lewes and the 19958 zip code are in Sussex County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Lewes?

Radon mitigation in Lewes 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 Lewes?

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 Delaware

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

City	Avg User Radon Level	Submissions
Middletown	7.43 pCi/L	7
Wilmington	5.50 pCi/L	4
Lewes	6.00 pCi/L	1
New Castle	4.00 pCi/L	1
Newark	No submissions	0