term blood lead reference level means the minimum concentration of lead in an individual’s blood, at or above which the jurisdiction or the Centers for Disease Control and Prevention, as applicable, recommends public health actions be taken. (3) Federally supported housing The term federally supported housing means housing for which assistance is provided by the Federal Government under— (A) section 221(d)(3) or 236 of the National Housing Act ( 12 U.S.C. 1715l(d)(3)