What type of sites should not be developed for septic systems?

The correct answer points out the importance of suitable soil characteristics for the effective functioning of septic systems. Septic systems rely on the natural processes of soil to treat and disperse wastewater. Sites with low percolation rates indicate that the soil does not allow water to move through it quickly. This situation can lead to wastewater pooling on the surface or within the septic system itself, resulting in system failures, potential contamination of groundwater, and public health hazards.

In contrast, sites with high permeability, sandy soil, or well-drained soil tend to allow adequate water movement and are generally more suitable for septic systems, as they facilitate proper drainage and treatment of effluent. Thus, the emphasis on avoiding low percolation sites is grounded in both environmental protection and the operational efficiency of septic systems.