Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

What is considered a safe level of lead concentration in the dust wipe samples collected during an assessment?

1. 10 ug/wipe

2. 25 ug/wipe

3. 50 ug/wipe

4. 70 ug/wipe

The correct answer is: 50 ug/wipe

The determination of a safe level of lead concentration in dust wipe samples is critically important in lead risk assessments, particularly in residential settings. According to the EPA's guidelines, a concentration of 50 micrograms per wipe (ug/wipe) is recognized as the action level for lead hazards in dust. If dust wipe samples collected during an assessment show lead concentrations at or above this threshold, it indicates a potential risk for lead exposure that may warrant further investigation and remediation. This value is based on extensive research and risk assessments aiming to protect public health, especially for vulnerable populations such as children who are more susceptible to the harmful effects of lead exposure. Levels below 50 ug/wipe are considered to not pose an immediate health risk, thus establishing 50 ug/wipe as the reference point for safe levels in dust wipe assessments.