What is one key consideration when evaluating land for subsurface sewage disposal?

One key consideration when evaluating land for subsurface sewage disposal is the percolation rate of the soil. This rate determines how quickly effluent can be absorbed into the soil, which is vital for preventing waterlogging and ensuring efficient treatment of wastewater. If the soil has a high percolation rate, it can quickly absorb and filter the wastewater, reducing the risk of surface contamination and maintaining groundwater quality.

The percolation test, often known as a "perc test," assesses this property, and local regulations frequently mandate it for septic system installation. Poor percolation can lead to slow absorption, leading to system failures, odors, and potential environmental contamination.

While aesthetic appearance, availability of amenities, and biodiversity are important factors in land evaluation, they do not directly impact the feasibility or effectiveness of a subsurface sewage disposal system as the percolation rate does.