Which treatment component can be installed by an Installer I?

The installation of a septic tank is designated for an Installer I because it falls within the scope of basic on-site sewage facility installations. An Installer I is trained and certified to handle conventional components of OSSFs, which include septic tanks, as they are considered the foundational first stage of treatment in the sewage disposal system.

Septic tanks work by allowing solids to settle at the bottom to form sludge while allowing lighter materials like grease to float to the top, creating scum. The wastewater that flows out of the septic tank into the drain field has already undergone basic treatment, making it a simpler installation compared to more complex systems.

In contrast, the other components mentioned—sand filters, constructed wetlands, and advanced treatment units—often require more specialized knowledge and skills, typically reserved for those with a higher certification level due to their complexity and the additional regulatory compliances that need to be adhered to.