What consideration should receive the greatest emphasis in selecting an OSSF disposal option?

Selecting an OSSF disposal option requires careful consideration of several factors, but soil and site conditions should receive the greatest emphasis. This is because the soil type, permeability, and the overall site characteristics directly influence the effectiveness and reliability of the disposal system. Proper assessment of these conditions ensures that the selected system can adequately treat and disperse effluent, preventing environmental contamination and public health risks.

A well-suited disposal option must align with the site's specific limitations and capabilities. For example, highly permeable soils may allow for a different type of system compared to clayey soils, which can impede drainage. Additionally, understanding the proximity to water bodies, the slope of the land, and the depth to groundwater will inform decisions related to system design and implementation. Ensuring compatibility with the existing environmental conditions is crucial for the long-term success and sustainability of the OSSF system.

While system cost, electrical rates, and maintenance and service availability are important considerations, they are secondary to ensuring that the site is capable of properly assimilating and treating wastewater. Addressing soil and site conditions first establishes a solid foundation for subsequent decisions regarding costs, operational efficiency, and maintenance concerns.