1.
Testing.
By March 1, 2014, and, unless a mitigation system has been installed in that residential building, every 10 years thereafter when requested by a tenant, a landlord or other person who on behalf of a landlord enters into a lease or tenancy at will agreement for a residential building shall have the air of the residential building tested for the presence of radon. For a residential building constructed or that begins operation after March 1, 2014, a landlord or other person acting on behalf of a landlord shall have the air of the residential building tested for the presence of radon within 12 months of the occupancy of the building by a tenant. Except as provided in subsection 5 , a test required to be performed under this section must be conducted by a person registered with the Department of Health and Human Services pursuant to Title 22, chapter 165 .