CDPH Lead Inspector/Assessor California State Practice Exam

What is the EPA/HUD definition of Lead-contaminated Dust?

1. Interior Floors ≥ 10 μg/ft2; Exterior Floor N/A

2. Interior Horizontal Surfaces ≥ 100 μg/ft2; Window Wells 400 μg/ft2

3. Interior Floors ≥ 10 μg/ft2; Exterior Floors ≥ 400 μg/ft2

4. Exterior Horizontal Surfaces ≥ 400 μg/ft2; Window Wells N/A

The correct answer is: Interior Horizontal Surfaces ≥ 100 μg/ft2; Window Wells 400 μg/ft2

The definition of Lead-contaminated Dust according to the EPA and HUD includes specific concentrations for different surfaces to help assess the presence of lead hazards in residential environments. The correct answer outlines that an interior horizontal surface is considered lead-contaminated dust if it has a concentration of 100 micrograms per square foot (μg/ft²) or greater, and window wells are deemed lead-contaminated when they measure 400 μg/ft² or more. This threshold aligns with the regulatory requirements for identifying lead hazards, which take into account various factors including living conditions and exposure risks. Interior surfaces, such as counters and floors, are critical areas where children might come into contact with lead dust, thereby necessitating lower thresholds to protect public health. The standard for window wells acknowledges the unique conditions of these areas, which can accumulate dust and debris more significantly than other surfaces, representing a higher risk for lead exposure. Understanding these definitions is essential for lead inspectors and assessors when evaluating lead hazards in homes, ensuring thorough assessments and proper remediation efforts to safeguard against lead exposure, particularly in vulnerable populations such as children.