Radon Testing in Delaware, Ohio

Radon Testing in Delaware, Ohio: What Local Data Shows

Delaware County is widely known for elevated radon potential. Buyers are often surprised by how frequently radon exceeds the EPA action level, even in clean, newer homes.

The key is expectation-setting: higher readings in this region can be typical, and mitigation is a common solution.

Delaware Radon Data Snapshot (From My Local Dataset)

In my dataset of 106 total radon tests, 4 tests were from Delaware addresses.

Delaware (n = 4 tests):

Average (mean): 7.95 pCi/L
Median: 7.45 pCi/L
Highest recorded: 13.6 pCi/L
Homes at/above 4.0 pCi/L: 75% (3 of 4)

EPA action level: 4.0 pCi/L

The median of 7.45 means elevated radon is not a fringe outcome in this sample, it’s the midpoint.

Why Delaware Homes Commonly Test Above 4.0

Radon is primarily a geology + pressure issue. Delaware homes can test higher due to:

soil conditions common to the county
basements and sump systems
winter stack effect and HVAC operation

This applies to both older homes and newer subdivisions.

How to Keep a Transaction Calm

Radon is scary mostly because it’s invisible. Once it’s measured, it becomes a straightforward decision:

test
interpret
mitigate if needed
move forward

A high result is not a moral failing of the home, it’s a typical regional condition with a known solution.

How This Radon Data Was Compiled

The statistics on this page are based on 106 professional radon tests performed in Central Ohio residential properties.

Each test was:

Conducted during a real estate transaction or property evaluation
Measured using professional-grade continuous radon monitors
Performed according to industry standards
Documented and archived

City-specific statistics reflect radon tests performed at properties located within that municipality.

Because radon levels can vary from home to home, these figures are intended to provide regional context, not predict results for any individual property.

Testing remains the only way to determine a specific home's radon level.

Radon Trends in Nearby Central Ohio Communities

Buyers often compare homes across Columbus, Westerville, Delaware, Sunbury, and Galena. Understanding regional radon trends helps set realistic expectations during a transaction. Radon levels vary across Central Ohio communities. Review radon data and trends in:

You can also view our full Central Ohio Radon Overview for area-wide trends.