CDPH Lead Inspector/Assessor California State Practice Exam

For properties built before 1960, when is random sampling of units acceptable?

1. More than 5 similar units

2. More than 15 similar units

3. More than 20 similar units

4. More than 25 similar units

The correct answer is: More than 20 similar units

Random sampling of units in properties built before 1960 is acceptable when there are more than 20 similar units. This practice is based on the understanding that a larger sample size increases the representativeness of the findings regarding lead hazards in a building, thereby providing a more reliable assessment. Properties constructed before 1960 are of particular concern for lead exposure, as they are likely to contain lead-based paint. By ensuring that random sampling is utilized when there are more than 20 similar units, assessors can improve the likelihood that the inspection results accurately reflect the presence of lead across the broader population of units. This helps in managing and mitigating health risks associated with lead exposure effectively. Using a sample size greater than 20 improves the statistical validity of the assessment, allowing inspectors to make better-informed decisions about lead safety measures in the property.