What is the primary purpose of a percolation test in septic installations?

The primary purpose of a percolation test in septic installations is to assess soil absorption ability. This test measures how quickly water can move through the soil, which is crucial for determining if the soil is suitable for a septic system. The results inform the installer about how well the soil can absorb and treat wastewater. Proper absorption is essential to prevent the overflow of treated sewage, which can lead to environmental contamination and system failure. Therefore, understanding the soil's percolation rate ensures that the septic system will function effectively and protect public health and safety.