Winterthur, DE Radon Mitigation and Testing

Q: What EPA Radon Zone is Winterthur in?

Winterthur is in New Castle County, EPA Zone 2.

Q: How much does radon mitigation cost in Winterthur?

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

New Castle County

EPA Zone 2

This small community in northern New Castle County is part of the greater Philadelphia Metro area, situated on Piedmont clay soils over crystalline bedrock formations. Housing consists primarily of suburban developments and estate properties, many featuring full basements common to the mid-Atlantic region's construction traditions. While specific radon testing data for zip code 19735 is limited, homeowners should pursue testing given the area's geological characteristics and regional radon potential.

Winterthur, DE Radon Mitigation

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

Winterthur, DE Radon Testing

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

Winterthur Radon Facts

Key details about the radon risk profile for Winterthur and the 19735 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

New Castle County, DE

Zip Code

19735

Predicted Screening Level

2–4 pCi/L (Zone 2)

Winterthur and the 19735 zip code are located in New Castle 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 Winterthur, DE

What EPA Radon Zone is Winterthur in?

Winterthur and the 19735 zip code are in New Castle 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 Winterthur?

Radon mitigation in Winterthur 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 Winterthur?

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