Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

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What is a potential source of lead hazard in a residential property?

Newly painted walls
Old plumbing systems
Modern electrical wiring
Outdoor landscaping

The correct answer is: Old plumbing systems

Lead hazards in residential properties primarily arise from sources that have historically used lead-based materials. Old plumbing systems are a significant concern because they often contain lead pipes and fixtures or lead solder used in piping. When water comes into contact with these materials, it can leach lead into the drinking water supply, posing serious health risks to residents, particularly children. While newly painted walls could potentially be a source of lead hazards if they contain old lead-based paint, modern regulations around paints have drastically reduced the risk from new applications. Modern electrical wiring does not typically contain lead and is not associated with lead hazards. Outdoor landscaping usually does not emit lead unless contaminated soil is present, which is less common than lead from plumbing systems. Therefore, old plumbing systems stand out as a well-documented and significant source of lead exposure in residential settings.