Radon Testing in Schools

Stillwater Area Public Schools takes safety very seriously and works diligently to ensure we provide safe and healthy learning environments for all of our students. 

Radon is a colorless, odorless gas that naturally comes from soil and has been linked to some cancer deaths when found at elevated levels.

While radon testing is not required for schools in Minnesota, our school district has tested our schools for radon and we have mitigated any issues when they arise.

Recent Testing

Formal radon testing in all of our buildings took place in 2018-2019 during the MN Department of Health recommended timeframe of November 1 through March 31. The testing was conducted by Field Environmental Consulting, using the MN Department of Health Radon in Schools Model Plan:

843 testing canisters were analyzed. Two had initial radon concentrations above 4.0 pCi/L:

  • Lily Lake Classroom 205 = 4.1 pCi/
  • Stillwater Middle School Office 189W = 7.5 pCi/L

Follow-up testing in those two rooms showed concentrations well below the action level:

  • Lily Lake Classroom 205 = 1.8 pCi/L
  • Stillwater Middle School Office 189W = .6 pCi/L

Per the Minnesota Department of Health, no further testing/mitigation is necessary. 2018-2019 test results for specific schools and buildings can be found below:

Afton-Lakeland ElementaryOak-Land Middle School
Andersen ElementaryStillwater Middle School
Brookview ElementaryStillwater Area High School
Lake Elmo ElementaryEarly Childhood Family Center
Lily Lake ElementaryCentral Services Building
Rutherford ElementaryOak Park Building
Stonebridge Elementary 


Previous Testing

We contracted with an environmental consultant to formally test all of our buildings for radon in 2006-2007 and to perform follow up testing in 2008 on buildings that had elevated radon levels. As a result of the original and follow-up testing, radon mitigation systems were installed at Marine Elementary in the fall of 2008 and Lake Elmo in the spring of 2009. Follow-up testing done in partnership with the MN Department of Health in 2010 and 2011 confirmed the elevated levels were lowered below the Environmental Protection Agency guidelines of 4 pCi/L (picocuries per liter of air).

During the 2012-2013 school year our operations staff tested Andersen, Lake Elmo and Marine Elementary using continuous radon monitoring devices provided by MN Department of Health. The tests were taken to monitor the district’s installed radon mitigation systems. At that time, none of those facilities had elevated levels of radon.

Homeowners are also encouraged to monitor for radon levels. For more information.