What information is primarily evaluated before allowing installation of an OSSF?

The primary information evaluated before allowing the installation of an On-Site Sewage Facility (OSSF) is soil and site conditions. This evaluation is critical because the performance and effectiveness of an OSSF are heavily influenced by the characteristics of the soil and the specific conditions of the site. Key aspects that are examined include soil type, percolation rate, drainage capabilities, depth to groundwater, proximity to water sources, and the overall landscape. Properly understanding these conditions ensures that the system can effectively treat wastewater and minimize environmental impacts.

In contrast, while the design of the home is important for overall planning and functionality, it does not directly determine whether the OSSF can function appropriately in the chosen location. The brand of the septic tank and the type of piping used are also relevant, but they are secondary to the foundational requirements of the site. Without suitable soil and site conditions, even the best systems and materials may fail, leading to significant health and environmental hazards. Thus, assessing soil and site conditions is the foremost step in the installation process of an OSSF.