When sampling low-rise buildings, where should dust wipe samples be collected from?

Dust wipe samples in low-rise buildings should be collected from multiple floors, including common areas, to accurately assess potential lead exposure. This approach ensures a comprehensive evaluation of lead dust, which can accumulate in various locations throughout the building, not solely in the entry areas or on exterior walls.

The rationale for sampling from multiple floors and common areas is that lead dust can be present wherever lead-based materials were used, whether in paint, plumbing, or other finishes. By including common areas, which are often frequented by multiple residents, the sampling reflects the potential for exposure for a larger population. Collecting samples from various floors also helps capture differences in dust loading that may occur due to factors such as foot traffic, maintenance activities, or proximity to sources of lead.

In addition, relying solely on areas identified by residents may not represent all potential lead exposure locations, as individuals may not be aware of all areas where lead dust could accumulate. Sampling only from entry areas would also exclude the significant risk that can be present in common living spaces and other shared environments within the building. Likewise, focusing only on exterior walls ignores the possibility of indoor lead dust contamination, which poses a risk to occupants, especially children. This thorough approach aligns with best practices in lead risk assessment, ensuring