What is the purpose of testing on all paint layers?

The purpose of testing on all paint layers is to achieve a more accurate measurement of lead. This is important because lead paint can be hidden beneath layers of non-lead paint, and simply testing the top layer may not reveal the presence of lead in older layers. It is critical for risk assessors to determine the total exposure risk, especially in homes or buildings constructed before lead-based paints were banned. By analyzing all layers, the assessor can gain comprehensive data regarding lead content throughout the structure, ensuring that any potential health risks are fully understood and addressed. This thorough approach is essential for accurately assessing lead risk and informing appropriate remediation strategies to protect public health, particularly for vulnerable populations such as children.