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This document provides guidelines for the planning, design principles and considerations of a decentralized/onsite water reuse system and water reuse applications in urban areas.This document is applicable to practitioners and authorities who intend to implement principles and decisions on decentralized water reuse in a safe, reliable and sustainable manner.This document addresses decentralized/onsite water reuse systems in their entirety and is applicable to any water reclamation system component (e.g. source water collection, treatment, storage, distribution, operation and maintenance and monitoring).This document provides:— standard terms and definitions;— description of system components and possible models of a decentralized/onsite water reuse system;— design principles of a decentralized/onsite water reuse system;— common assessment criteria and related examples of water quality indicators, all without setting any target values or thresholds;— specific aspects for consideration and emergency response.Design parameters and regulatory values of a decentralized/onsite water reuse system are out of the scope of this document.