Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

What is the lead-based paint (LBP) concentration threshold per XRF measurement?

1. Less than 0.5% by weight

2. Greater than 0.5% by weight

3. 1.0% by weight

4. 0.1% by weight

The correct answer is: Greater than 0.5% by weight

The correct threshold for lead-based paint (LBP) concentration, as determined by X-ray fluorescence (XRF) measurements, is indeed recognized as greater than 0.5% by weight. This standard is crucial for identifying whether a painted surface is considered hazardous under federal regulations. XRF is a non-destructive testing method widely used to measure lead concentrations in paint, and the distinction at 0.5% is significant because it helps to implement necessary lead hazard reduction and abatement measures. When levels exceed this threshold, it indicates that the potential for lead exposure exists, especially for populations vulnerable to lead poisoning, such as children. Overall, the significance of the threshold stems from promoting public health and enabling regulatory agencies like the EPA to enforce guidelines that prevent lead exposure in residential and public properties.