Type 2 onsite sewerage systems are increasingly selected in British Columbia when site constraints make Type 1 approaches difficult or when enhanced treatment performance is needed to support a defensible dispersal strategy. For ROWP planner-installers, the decision to specify Type 2 is not only a design choice, but also a lifecycle commitment that must align with the Sewerage System Regulation (SSR), the Standard Practice Manual (SPM), installation realities, and long-term operation and maintenance (O&M). This session provides a practical, planner-installer focused comparison of two common Type 2 pathways: Advanced Treatment Units (ATUs) and Combined Treatment and Dispersal Systems (CTDS). Attendees will review where Type 2 systems offer clear advantages (constrained lots, limiting soil characteristics, reduced dispersal footprint) and where they introduce risk (power dependence, mechanical complexity, reduced vertical separation, owner suitability, and increased O&M obligations). The presentation will highlight key specification and installation details that most often determine performance, including access to required materials, homeowner obligations and availability of trained maintenance providers. Participants will leave with a clear framework for selecting between ATU and CTDS solutions based on site drivers and supportability, along with a practical checklist to strengthen defensibility, reduce call-backs, and improve long-term outcomes for owners and practitioners.