What is the recommended depth for taking a soil sample?

The recommended depth for taking a soil sample is 2 inches. This depth is generally considered optimal for obtaining a representative sample that reflects the lead content in the top layer of soil. Soil contamination is often concentrated in the uppermost layers due to environmental factors, such as lead falling from deteriorating paint or atmospheric deposition.

By sampling at 2 inches, inspectors can ensure they are assessing the most relevant portion of soil that may pose a risk of lead exposure, particularly in residential areas where children are likely to play and come into contact with the soil. This depth balances the need to obtain a sample that is deep enough to capture significant contamination while being shallow enough to reflect the active layer most impacted by lead sources. In various regulatory and professional guidelines, this standard helps facilitate consistent and effective soil assessment practices, ensuring public health protections are met.