When performing Target Sampling in a multi-family dwelling with 13 similar units, what is the minimum number of units that should be sampled?

In the context of Target Sampling within a multi-family dwelling, particularly when dealing with a total of 13 similar units, the ideal practice involves ensuring that a representative sample is collected for accurate risk assessment. According to established sampling protocols, the minimum number of units that should be sampled is typically calculated to ensure statistically valid results while considering the total population.

Sampling six units from a total of 13 would not adequately capture the variability and possible lead hazards present in all units. When guidelines stipulate a minimum of seven units, this approach ensures a more robust representation, especially in environments such as multi-family dwellings where conditions may vary slightly from one unit to another, despite their similarities. By choosing to sample at least seven units, the assessor improves the likelihood of identifying any potential lead hazards across the broader range of units in the building, thus facilitating a more comprehensive risk assessment.

This reasoning aligns with best practices in lead risk assessments, ensuring that critical information is not missed due to inadequate sampling. Thus, the minimum standard of seven units reflects a commitment to thoroughness in evaluating potential risks associated with lead exposure.