A new pipe sizing standard marks the first major update to water distribution and sanitary drainage design in decades. Developed through extensive academic research, the standard reflects how buildings and water usage have evolved—accounting for factors such as household size, occupancy patterns, regional conditions, and modern lifestyles. Rather than relying on assumptions rooted in older building models, the updated approach uses data‑driven methods to more accurately predict demand and peak flow within plumbing systems.

By aligning pipe sizing with real‑world usage, the new standard aims to improve system performance, reduce construction costs, and enhance water hygiene by minimizing stagnation. It also supports faster hot water delivery, energy savings, and improved sanitary drainage performance. Designed to evolve over time, the standard is supported by ongoing research, data collection, and future training, positioning it as a long‑term framework for modern plumbing design across residential, multi‑family, and mixed‑use buildings. Click here to read more.