Int. J. Environ. Res. Public Health 2018, 15, 2149
4 of 9
Table 1. Radon testing in schools: State policies.
State
% of Counties
Designated as EPA
Zone 1 or Zone 2 a
Radon Test
Time Requirement
for Initial Testing
Frequency of
Re-Testing
Type of School
Covered
Who May
Conduct the
Testing
Public Private SE CP
New School
RRNC
Requirement Mitigation
Requirement for
Radon Level ≤ 4
pCi/L
Colorado 100 Required Within 19 months of
occupancy ND Yes Yes ND ND No No
Connecticut 87.5 Required ND Every 5 years Yes No No Yes Yes Yes
Florida 13.4 Required b Within 12 months of
occupancy Twice, 5 years
apart Yes Yes No Yes No No
Illinois 100 Recommend ND Every 5 years Yes No Yes Yes No No
Iowa 100 Encourage ND ND Yes Yes No Yes No No
Minnesota 100 Voluntary ND ND Yes No Yes Yes No Yes c
New Jersey 85.7 Required ND Every 5 years Yes No Yes Yes Yes No
ND ND Yes No No Yes No Yes
Every 10 years Yes No Yes Yes Yes No
ND Every three
years f Yes Yes No Yes No Yes
New York
Oregon
75.8
58.3
Required
d
Required
ND
e
Rhode
Island 80 Required Tennessee 77.8 Encourage ND ND Yes No ND ND No No
ND Yes No Yes Yes No Yes
Every 5 years Yes No No Yes Yes Yes
Virginia 71.6 Required With 18 months of
occupancy
West
Virginia 87.5 Required With 12 month of
occupancy
ND: Not Defined; SE: School Employees; CF: Certified Professionals. a : Based on USEPA Radon Map https://www.epa.gov/radon/find-information-about-local-radon-zones-and-
state-contact-information#radonmap. b : All schools in continuous use since before 1 July 1994 must test 100% first floor or below grade rooms, 20% second floor rooms, and 10% third
floor rooms; For school opened between 1 July 1994 and 30 June 1999 must test 100% first floor; For school opened or structurally changed since 1 July 1999, 20% of ground contact rooms
must be tested. c : School districts that receive health and safety revenue to conduct radon testing must take re-test after corrective measures that reduce radon levels. d : School should
review geological potential for radon and to decide if test is necessary. Radon testing is only required for public schools located in Radon Zone 1. e : Statewide radon testing in school
must be completed on or before 1 January 2021. f : If initial testing is ≤ 4 pCi/L, 10% of the areas must be re-tested 3 years after; A different 10% of the building must be tested every 3
years thereafter.