For clearance sampling, what is the acceptable level of lead on floors?

The acceptable level of lead on floors for clearance sampling is specified to be 40 micrograms per square foot (µg/ft²). This standard is established to ensure a safe environment, particularly in residences that may have a history of lead-based paint or other lead sources. When clearance sampling is conducted after lead abatement, the goal is to confirm that the lead levels are low enough to pose minimal risk to occupants, especially vulnerable populations such as children.

Levels above this threshold could indicate that the lead abatement was not entirely effective, and further remediation may be necessary to ensure safety. While other levels listed in the question either exceed this threshold or are not recommended for clearance parameters, the 40 µg/ft² benchmark is recognized as effective in minimizing health risks associated with lead exposure. This understanding is critical for Lead Abatement Supervisors to ensure compliance with safety standards and protect public health.