Excessive radon detected in Wilton High School's athletic office

The radon level in Wilton High School’s athletic director’s office exceeds the U.S. Environmental Protection Agency (EPA)’s recommended radon exposure limit of 4.0 picocuries per liter of air (pCi/L), according to radon test results the Wilton School District received on May 7.

In addition to the high school, the Wilton School District also received the results of testing conducted at Cider Mill and Middlebrook.

Superintendent Gary Richards shared the results of the radon testing, conducted by Cardno ATC, at the Board of Education’s May 8 meeting.

According to Cardno ATC’s final report, the laboratory analytical results for the high school’s athletic director’s office, located in the Field House, measured 7.4 pCi/L.

“No other results for the radon re-evaluation air samples in Wilton High School were above the EPA recommended action level of 4.0 pCi/L,” the report states.

As for Cider Mill and Middlebrook, the report states:

  • Cider Mill’s air samples were all below 4.0 pCi/L, with the highest result measuring 2.3 pCi/L.
  • Middlebrook’s air samples were all below 4.0 pCi/L, with the highest result measuring 0.9 pCi/L.

Radon re-testing at the three schools was conducted March 5-7 by licensed radon measurement provider and qualified Connecticut school radon testing professional Neal Freuden, of Cardno ATC.

Air samples were taken from 10% of “frequently occupied rooms that come into contact with the ground” at each of the three schools, according to the Cardno ATC report.

Thirteen rooms at the high school, 13 rooms at Cider Mill and 11 rooms at Middlebrook were sampled for testing.

Next steps

The Connecticut Department of Public Health recommends corrective action be taken for radon levels equal to or greater than 4.0 pCi/L.

As a results of the 7.4 pCi/L levels Wilton High School’s athletic director’s office, Cardno ATC recommended that school administration hire a radon mitigation professional, certified by the National Environmental Health Association or the National Radon Safety Board, to reduce the radon levels.

Since Cider Mill and Middlebrook’s results were below the 4.0 pCi/L action level, “no corrective actions need to be taken at this time,” according to Cardno ATC.

Dr. Richards said the school district has scheduled to meet with a radon mitigation firm early next week to find out what steps need to be taken.

View a copy of the full radon re-testing report here.