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A Radon Mystery on a Home Inspection in Nassau NY

A Home Inspection I performed in Nassau NY


A unique radon issue we encountered.

I wanted to write a blog about a radon situation I encountered on a property that I performed a home inspection on in Nassau New York. At the initial home inspection, we tested for radon levels. The property already had a radon mitigation system installed that appeared to be working perfectly.

Our radon levels came back high approximately 12.0, so the owner called back the radon mitigation company that put the radon system in 10 years ago to further assess. The radon mitigation company installed an additional suction area to pull the radon gas below the slab from a seperate and distinct area to see if that would solve the problem.


Two more tests were done one electronic and one with charcoal canisters to determine if the radon levels were resolved and reduced to a normal level. Both radon tests returned very high results almost as if the radon mitigation system was never installed.



The owner and the radon mitigation company started to brainstorm to try abs figure out why the radon levels were still high. The radon mitigation company ended up sealing the very small cracks on the slab as the radon can leak into the basement from the small slab cracks. After they sealed the cracks they tested for radon one more time. A radon test was done and the normals were in fact still high.


After a few days the buyer requested that a radon test was done to determine if the radon levels in the water were normal. The buyer was concerned about the radon within the well water.


Shield Guard Home Inspections returned to the home to take water samples. As I was in the home collecting water samples I was curious to see what was going on in the basement with the radon issue. As I was standing in the basement I started to think there has to be a way the radon is leaking into the basement through a decent size opening.


The basement was a poured foundation with a typically newer slab. The basement contained reflective insulation on the wa