Radon testing rarely makes the top of a homebuyer’s list, mostly because radon itself cannot be seen, smelled, or tasted. But radon testing is one of the more important steps a buyer in Westfield and across Union County can take before closing, precisely because the gas is completely undetectable without specialized equipment.

Why Radon Testing Matters in This Part of New Jersey

It Is the Second Leading Cause of Lung Cancer

Radon is a naturally occurring radioactive gas produced by the breakdown of uranium in soil and rock. According to the EPA, radon exposure is the second leading cause of lung cancer in the United States, behind only smoking. It seeps into homes through foundation cracks, sump pits, and gaps around pipes, and because it has no smell or color, radon testing is the only way to know whether a home has an elevated level.

Northern and Central New Jersey Sit in Elevated Risk Areas

Much of Union County and the surrounding parts of North and Central New Jersey fall within EPA radon zones that predict moderate to high average indoor radon potential. Westfield’s mix of older homes with basements and newer construction both warrant testing, since radon concentration depends on the specific soil conditions and construction details of each individual property rather than a general area assumption.

It Is Inexpensive Relative to the Risk

Radon testing is a small cost compared to what is at stake. A short-term test typically runs over 48 hours using a continuous radon monitor, and the investment is minor next to the long-term health implications of living in a home with elevated levels that go undetected.

How Radon Testing Actually Works

Continuous Monitors Provide Reliable Data

We use a continuous radon monitor, which records readings at regular intervals throughout the test period rather than producing a single average number. This gives a more complete picture of how radon levels fluctuate, including any spikes tied to weather, HVAC cycling, or time of day, rather than relying on a single passive device that only produces an average.

Closed House Conditions Improve Accuracy

For radon testing to produce a reliable result, the home needs to be in closed house conditions for at least 12 hours before the test begins and for the full duration of testing. That means windows and exterior doors stay closed except for normal entry and exit, since outside air exchange can artificially lower the reading and mask an actual problem.

Results Come With Clear Next Steps

The EPA recommends mitigation when radon testing shows results at or above 4 picocuries per liter, though even results in the 2 to 4 range are worth discussing further, since there is no truly safe level of radon exposure. Our reports lay out the numbers clearly, along with what they mean and what a mitigation system typically involves if one is needed.

What Happens If Levels Come Back High

Mitigation Is a Well-Established Process

Radon mitigation typically involves installing a vent pipe and fan system that draws radon from beneath the foundation and releases it above the roofline, away from windows and living space. It is a common repair, not a home-ending discovery, and most licensed mitigation contractors in the area can complete the installation within a day or two.

It Is a Reasonable Point of Negotiation

If radon testing during a home inspection reveals an elevated result, buyers often use this as a point of negotiation, either asking the seller to install a mitigation system before closing or requesting a credit to handle it after the sale. Having results in hand well before closing gives you real leverage and real options.

Enjoying Westfield Once the Testing Is Behind You

Once your inspection and radon testing are complete and the paperwork is settled, Westfield has plenty to offer as you get to know the neighborhood. The town’s Recreation Department maintains Tamaques Park and other green spaces throughout the community, and their site is a good place to start exploring at Westfield Parks and Fields.

Frequently Asked Questions

Is radon testing included in a standard home inspection?

Radon testing is typically offered as an add-on service alongside a standard home inspection rather than included automatically. Given how common elevated readings can be in this part of New Jersey, we recommend adding it for any home purchase.

How long does radon testing take?

A short-term radon test using a continuous monitor typically runs for 48 hours, with the home kept under closed house conditions for the duration of the test and for at least 12 hours beforehand.

What radon level is considered dangerous?

The EPA recommends taking action when radon testing results reach 4 picocuries per liter or higher, though there is no level considered completely risk free. Results between 2 and 4 picocuries per liter are still worth discussing with a mitigation professional.

If radon testing shows a high result, does that mean I should not buy the home?

Not necessarily. Elevated radon is a fixable issue in the vast majority of cases through a mitigation system, and many buyers use the results to negotiate repairs or credits with the seller rather than walking away from an otherwise sound home.

Buying a home in Westfield or Union County? Schedule your inspection with Top Notch Home Inspection and ask about adding radon testing to your visit.