(a) A rental unit certified as lead safe must be recertified in each of the following circumstances:
(1) Prior to the commencement of a rental agreement that begins more than 4 years after the date on which the unit was last certified as lead safe.
(2) When an elevated blood lead level is found in an individual residing in the unit.
(3) When a lead-based paint hazard is discovered in the rental unit or premises.
(b) A rental unit certified as lead free must be recertified if any of the following occurs:
(1) A lead-based paint hazard is discovered in the rental unit or premises.
(2) An elevated blood lead level is found in an individual residing in the unit.