What ensures that the installation of an OSS prevents surface water from accumulating?

Grading the site appropriately is crucial for the installation of an on-site sewage system (OSS), as it directly impacts the flow of water and drainage on the property. Proper grading involves contouring the soil to facilitate the movement of surface water away from the septic system and prevent ponding or accumulation near the area. This process ensures that rainwater and runoff do not pool on or around the OSS, which can lead to system failure and contamination of the surrounding environment.

By creating a slope away from the installation site, grading minimizes the risk of water accumulation which could saturate the soil and impede the absorption of effluent, ultimately affecting the overall functionality of the septic system. This practice also helps maintain the integrity of the system over time and ensures that it operates efficiently by enhancing the natural drainage patterns of the site.