Why must a test location include all layers of paint?

Including all layers of paint in a test location is crucial because it ensures that the assessment accurately reflects the areas most likely coated with lead-based paint. Older homes, built before 1978, often have multiple layers of paint, and lead-based paints are frequently found in the earlier layers. By sampling all layers, assessors can identify the presence of lead at different depths, which is critical for understanding the full extent of lead risk in a property.

Testing only the top layer may overlook hazardous lead content found beneath, leading to potential health risks for occupants, especially children. Therefore, the thorough assessment, including all paint layers, helps provide a more comprehensive understanding of the lead hazard and ensures effective risk management strategies can be implemented.