Indoor Radon levels in New Hampshire

According to EPA, New Hampshire has areas with HIGH and MODERATE potentials for elevated indoor radon levels. However, the EPA also says every home, regardless of location, should be tested for radon since elevated levels have been found in all areas.

While a region’s geology is a key contributor to determining the risk for elevated indoor radon levels, it is by no means the only factor. Our map cannot tell you if your home is likely (or not likely) to have a radon problem. In fact, it demonstrates that homeowners in the same region are reporting varying levels of indoor radon.

Indoor radon levels vary due to factors like soil composition, building foundation type, ventilation, and home construction. Cracks, sump pumps, and basements can increase radon gas entry points. Weather, air pressure, and lifestyle habits also impact radon accumulation, leading to differences between neighboring homes.

Because there are so many variables aside from the area’s geology that can cause radon to accumulate, the EPA recommends testing every home. It’s the only way to know your radon levels for sure.

Some states and organizations run programs to provide free radon test kits. These are small containers that you place in your home for a designated period of time, and then mail to a lab for processing within a few weeks. They provide a short-term indication of your home’s radon level.

While we strive to provide accurate and up-to-date information, we cannot guarantee the completeness or accuracy of the data contained within these datasets. This map is for informational purposes only and is not meant as a guide to determining if you should test your home for radon.

The EPA clearly recommends that all homeowners should test their homes for radon, regardless of location.

*Data from the monitors is shared here with the homeowner’s express permission. The data is anonymized and aggregated for visualization.*