According to the Department of Human Services codes for licensed child care centers, it states that centers operating in facilities that are at ground level, use a basement area as program space, or have a basement beneath the program area shall have a radon test performed as prescribed by the Iowa Department of Public Health. Testing shall be done every two years from the date of the initial measurement. If testing determines confirmed radon gas levels in excess of 4.0 Pico curies per liter, a plan using radon mitigation procedures established by the Iowa Department of Public Health shall be developed with and approved by the Iowa Department of Public Health.