New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard which is identical with ISO 20426 : 2018 ‘Guidelines for health risk assessment and management for non-potable water reuse’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Environment Protection Sectional Committee and approved by the Chemical Division Council. Due to water shortage, wastewater reuse has become an alternative water source that is suitable for satisfying the majority of water demands with exception of drinking which require higher water quality. On the other hand, increased water reuse practices are raising concerns regarding potential health implications. This has led to an increasing need to specify water quality parameters that are appropriate to specific water applications and uses, as well as the development of methods to assess and manage health risks from both regulator and user sides. Considering the importance to develop standard for providing guidelines on health risk assessment and management for non-potable water reuse and to follow the uniform practices globally, the Committee felt that it would be more convenient to prepare this standard by adoption of ISO 20426 on dual numbering system.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appears referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.