What is a key factor in the sustainability of OSSF systems?

The sustainability of On-Site Sewage Facilities (OSSF) is heavily influenced by the soil type and drainage capacity. The soil is a critical component in the treatment and disposal of wastewater, as it affects how effectively contaminants are filtered and broken down before the water reaches the groundwater or surface water. Different soil types have varying permeability, which can significantly impact the system's ability to properly absorb and treat wastewater.

For instance, sandy soils tend to drain quickly, which can be beneficial for certain types of OSSF systems, while clay soils may retain water, leading to potential issues with wastewater moving through the soil as intended. Adequate drainage capacity ensures that the effluent can be treated effectively and minimizes risks of ponding or surface runoff, which can lead to environmental contamination. Therefore, understanding local soil conditions and drainage capacity is essential for designing and implementing sustainable OSSF systems that protect public health and the environment.