"Water reuse is no longer a specialty niche; it’s becoming a core competency for plumbing engineers as municipalities and building owners face mounting pressure to reduce potable water consumption and meet increasingly ambitious water-reduction targets. Designing a system that actually works in the field, however, requires navigating a complex convergence of regulatory considerations, engineering decisions, code requirements, and operational realities that no simple checklist can fully address. This session offers a deep dive into the engineering design and real-world implementation of onsite graywater, black water, and rainwater reuse systems. Starting from the feasibility analysis phase, you’ll learn about the decision points that determine system viability: water balance calculations, demand-side matching, and the selection of treatment technologies appropriate for intended end uses. You will explore how building type, occupancy patterns, and site-specific constraints shape system architecture and where engineers commonly miscalculate.
The session will then turn to the regulatory environment, breaking down how the International Plumbing Code (IPC) and Uniform Plumbing Code (UPC) treat onsite reuse systems differently and how those differences cascade into real project implications. With state and local regulations continuing to evolve, you’ll receive updated information on ordinances, grants, and other incentives that are available and how those may affect your project’s design decisions.
The session will conclude with case studies drawn from commercial, multifamily, and institutional projects, examining how design intent translates (and sometimes doesn’t) into operational performance. From navigating the regulatory landscape to commissioning challenges and long-term operational considerations, you will leave with a concrete, actionable framework for bringing onsite reuse systems to life on your next project."