During the evaluation of land for an OSSF, which hazard must be specifically assessed?

Assessing flood hazards during the evaluation of land for an On-Site Sewage Facility (OSSF) is crucial because flooding can significantly impact the functionality and effectiveness of sewage systems. When a site is prone to flooding, there is a risk that effluent can escape the designated treatment area, leading to contamination of surrounding water bodies and groundwater.

Flooding can hinder the natural processes required for sewage treatment and may even render the system inoperable during high water events. Additionally, infrastructure or components of the OSSF, such as tanks and leach fields, can be damaged by prolonged exposure to floodwaters, leading to costly repairs or replacements. Therefore, identifying flood risks is a key component of ensuring that the OSSF will operate safely and effectively over its intended lifespan.

Other hazards like wildfires, noise, and air quality issues, while important for overall site assessment, do not have the same direct and immediate impact on the operation and safety of on-site sewage facilities as flood hazards do.