Delmar, DE Radon Mitigation and Testing

Q: What EPA Radon Zone is Delmar in?

Delmar is in Sussex County, EPA Zone 3.

Q: How much does radon mitigation cost in Delmar?

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

Sussex County

EPA Zone 3

Straddling the Delaware-Maryland border in Sussex County, Delmar sits on the Delmarva Peninsula where coastal plain sediments typically produce lower radon concentrations. The community's location in EPA Zone 3 and predominant slab-on-grade construction create conditions less favorable for radon accumulation than inland areas. However, testing data for zip code 19940 remains sparse, making baseline radon testing advisable for homeowners to understand their property-specific risk levels.

Delmar, DE Radon Mitigation

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

Delmar, DE Radon Testing

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

Delmar Radon Facts

Key details about the radon risk profile for Delmar and the 19940 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Sussex County, DE

Zip Code

19940

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Delmar and the 19940 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 Delmar, DE

What EPA Radon Zone is Delmar in?

Delmar and the 19940 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 Delmar?

Radon mitigation in Delmar 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 Delmar?

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