ISO 18997:2025

This International Standard is intended to standardize the implementation of reclaimed water for scenic environmental uses by regulating the water quality and quantity, guiding the progress of planning, operating, and management. This International Standard is applicable to practitioners and regulatory authorities who propose to implement principles and guidelines on the implementation of reclaimed water for scenic environmental uses, which aims to achieve a safe, stable, and efficient utilities of reclaimed water. This International Standard presents: 1. Introduction 2. Scope of the guidelines 3. Normative references 4. Terms and definitions 5. General requirements 6. Requirements of water quantity 7. Requirements of water quality 8. Additional treatment 9. General management 10. Emergency response 11. Others