This notice for comment seeks public input regarding HUD's intention to revise the elevated blood lead level EBLL threshold in HUD's requirements for assisted housing. HUD intends to revise its EBLL threshold to 3.5 micrograms of lead per deciliter gdL of blood for a child under the age of 6 consistent with the Centers for Disease Control and Prevention's CDC current blood lead reference value BLRV of 3.5 gdL of blood for a child under the age of 6. The CDC uses its BLRV for encouraging actions such as environmental investigations of homes to identify potential sources of lead. When HUD last amended its EBLL threshold in 2017 CDC's BLRV for children under the age of 6 was 5 gdL the level HUD uses as its current EBLL threshold.