Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

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What lead concentration is considered hazardous in window sills according to EPA?

300 ug/ft2
400 ug/ft2
500 ug/ft2
600 ug/ft2

The correct answer is: 400 ug/ft2

The determination of hazardous lead concentration in window sills according to the EPA is set at 400 micrograms per square foot (ug/ft2). This threshold is based on extensive research and risk assessments conducted by the EPA, indicating that lead levels at or above this concentration present a significant risk of lead exposure, particularly to young children who are more susceptible to the harmful effects of lead poisoning. This specific value reflects the recognition that window sills are a common area where lead dust accumulates, especially in older housing built before the implementation of lead-based paint regulations. The EPA's guideline is aimed at protecting public health by identifying and mitigating risk factors associated with lead exposure. When lead levels in these areas exceed 400 ug/ft2, it triggers a requirement to conduct a risk assessment and implement measures to reduce lead hazards to protect occupants, especially vulnerable populations like children. Understanding this threshold is crucial for lead risk assessors, as it guides remediation efforts and helps ensure that actions are taken to prevent lead exposure in environments where children reside or spend time.