The third edition of the WHO Guidelines for the safe use of wastewater,
excreta and greywater has been extensively updated to take account of
new scientific evidence and contemporary approaches to risk management.
The revised Guidelines reflect a strong focus on disease prevention and
public health principles.
This new edition responds to a growing demand from WHO Member
States for guidance on the safe use of wastewater, excreta and greywater
in agriculture and aquaculture. Its target audience includes environmental
and public health scientists, researchers, engineers, policy-makers and
those responsible for developing standards and regulations.
The Guidelines are presented in four separate volumes: Volume 1: Policy
and regulatory aspects; Volume 2:Wastewater use in agriculture; Volume 3:
Wastewater and excreta use in aquaculture; and Volume 4: Excreta and
greywater use in agriculture.
Volume 1 of the Guidelines presents policy issues and regulatory measures
distilled from the technical detail found in volumes 2, 3 and 4. Those faced
with the need to expedite the development of policies, procedures and
regulatory frameworks, at national and local government levels, will find
the essential information in this volume. It also includes summaries of the
other volumes in the series.
Volume 2 of the Guidelines explains requirements to promote safe use concepts and practices, including health-based targets and minimum procedures. It also covers a substantive revision of approaches to ensuring the microbial safety of wastewater used in
agriculture. It introduces health impact assessment of new wastewater projects.
Volume 3 of the Guidelines informs readers on the assessment of microbial
hazards and toxic chemicals and the management of the associated risks
when using wastewater and excreta in aquaculture. It explains requirements
to promote safe use practices, including minimum procedures and specific
health-based targets. It puts trade-offs between potential risks and nutritional
benefits in a wider development context.
Volume 4 of the Guidelines focuses exclusively on the safe use of excreta
and greywater in agriculture. Recent trends in sanitation, including ecological
sanitation, are driven by rapid urbanization. The momentum created by the
Millennium Development Goals is resulting in dramatic changes in human
waste handling and processing. New opportunities enable the use of human
waste as a resource for pro-poor agricultural development, particularly in
periurban areas. Best practice to minimize associated health risks is at the
heart of this volume.