ISO 18997:2025

Water reuse in urban areas — Guidelines for urban reclaimed water for landscaping uses ISO 18997:2025

Publication date:   Aug 1, 2025

Scope

This document provides a guideline for good design and practice for urban reclaimed water that recharges into landscape water, including urban stream flow (e.g. rivers and lakes), aesthetic impoundments and wetlands replenishment, to ensure the proper support of the aquatic ecosystem. This document covers urban stream flow and leisure with possible incidental body contact. It does not cover urban irrigation, such as the irrigation of elements of the natural environment, urban public areas, or residential areas. It does not cover the cultivation of aquatic plants or animals for food purposes, including their sale.
This document provides recommendations for reclaimed water for landscaping uses, including those for planning, design, management, and maintenance.