CDPH Lead Inspector/Assessor California State Practice Exam

Which wipe test area has the highest failure rate?

1. Ceiling

2. Floor

3. Window trough/sill

4. Doors

The correct answer is: Window trough/sill

The window trough/sill is recognized for having the highest failure rate in wipe tests due to several factors. First, window areas are often subjected to weathering and environmental conditions that can contribute to the degradation of lead-based paint, creating lead dust that can accumulate. Additionally, window troughs typically have higher surface rates of lead dust accumulation because they are often not cleaned regularly compared to other surfaces, leading to a buildup over time. Surface interactions, such as opening and closing windows, can disturb lead particles, leading to higher levels of contamination. In contrast, floors, ceilings, and doors may not experience the same consistent disturbance or accumulation mechanisms as window troughs. This information highlights the importance of focusing attention on these high-risk areas during inspections and assessments as they represent a source of exposure that may significantly affect health, especially in residential settings with children. Understanding the dynamics of lead dust accumulation in various environments underscores the necessity for thorough monitoring and remediation efforts in these specific areas.