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Delaware Radon Information

Delaware Radon Program:

Radon Website: Website
Radon Contact: Kurt Olinger
Active Radon Program: Yes
Require License for Radon Professionals: Yes

Delaware is the second smallest state in terms of size, and the sixth least populous. Of course, it also happens to be the sixth most densely populated state in the country.

The ZIP code areas in the state with the highest percentages of radon over the EPA action level are Middletown (27%) and Odessa (22%). The ZIP code areas with the highest percentages between 15%-20% over the action level are Townsend (17%), Arden (17%), Hockessin (17%), and Talleyville (15%). It would appear that all of these areas have some form of granitic rocks above or below the ground surface.

The radon levels in the state of Delaware are about average except for several specific areas. Regardless, there’s an increased risk for all homeowners, which is why we recommend testing exposure levels at least twice a year.

According to test data published by the state, in Delaware there are two general areas that have an increased potential for elevated radon levels in homes. Both areas are in New Castle County and are associated with granitic rocks in northern and southern regions of the county, which matches information published by the USGS and EPA.

Delaware Radon Mitigation and Testing

Need your home tested for radon? Already know you have high levels and need a radon reduction system installed? Finding qualified Radon professionals can be difficult, but we've put together a list of Delaware contractors to help you save time.

Delaware Radon Mitigation

We have compiled a list of qualified radon mitigation contractors.
Find Radon Mitigation Contractors here

Delaware Radon Testing

Need your home or office tested for Radon? We have compiled a list of qualified radon testing contractors.
Find Radon Testing Contractors here

Delaware Radon Levels

Map of Delaware Radon Levels

Zone 1 (1): Potential for radon levels above 4 pCi/L according to EPA
Zone 2 (2): Potential for radon levels between 2 pCi/L and 4 pCi/L according to the EPA
Zone 3 (3): Lowest EPA level with expected radon levels at or below 2 pCi/L
Disclaimer: It is strongly recommended that all households, schools and office spaces test radon levels individually. The EPA Radon Zone data is not an indicator of individual test results, but a guideline for strategic planning. Toxic radon levels can be found in all counties, regardless of their zone rating. While we make efforts to keep this information up to date, it is derived from third­party sources which may not be accurate or reflect the most current statistics.

Delaware Radon Statistics

Delaware has 3 counties and 0 (0%) have been assigned Zone 1 counties by the EPA. Zone 1 counties have the highest potential to have homes test higher than 4 pCi/L. Delaware's state radon zone average is 2.67, which is the average of all county zone ratings the EPA has assigned the state, ranking it 44 among all states.

Delaware Radon Contractor License Information

Does Delaware require contractors to be licensed? Yes.

What are the licensing requirements? The requirements are as follows:

  1. Attend and complete an approved qualification course.
  2. Take and pass the national certification examination from the NRPP or NRSB.
  3. Submit national certification application.
  4. Fill out the Delaware Residential Mitigation Service Provider application.

Delaware Radon Real Estate Requirements

Does the state of Delaware require radon testing for all real estate transactions? No

However both the state of Delaware and the EPA recommend that a home or residence should be tested before a real estate transaction is carried out. Even though Delaware does not require radon testing, we certainly recommend you have a test performed before you purchase a home. If you decide to perform a test after and find elevated levels, there is no reason to panic. Delaware radon mitigation is not expensive compared to the dangers and a system can be implemented in a relatively short period of time.

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