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Version 1
16. February 2024.
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by WHO,

Guidelines for drinking-water quality: small water supplies

by WHO,

These Guidelines, specifically tailored to small water supplies, build on over 60 years of guidance by the World Health Organization (WHO) on drinking-water quality and safety. They focus on establishing drinking-water quality regulations and standards that are health based and context appropriate; on proactively managing risks through water safety planning and sanitary inspections; and on carrying out independent surveillance. The guidance is intended primarily for decision-makers at national and subnational levels with responsibility for developing regulatory frameworks and support programmes related to these activities. Other stakeholders involved in water service provision will also benefit from the guidance in this document.

Version 2
11. July 2017.
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by Karen Setty et al., 19. February, 2017

Water quality, compliance, and health outcomes among utilities implementing Water Safety Plans in France and Spain

by Karen Setty et al., 19. February, 2017

Water Safety Plans (WSPs), recommended by the World Health Organization since 2004, seek to proactively identify potential risks to drinking water supplies and implement preventive barriers that improve safety. To evaluate the outcomes of WSP application in large drinking water systems in France and Spain, we undertook analysis of water quality and compliance indicators between 2003 and 2015, in conjunction with an observational retrospective cohort study of acute gastroenteritis incidence, before and after WSPs were implemented at five locations. Measured water quality indicators included bacteria (E. coli, fecal streptococci, total coliform, heterotrophic plate count), disinfectants (residual free and total chlorine), disinfection by-products (trihalomethanes, bromate), aluminum, pH, turbidity, and total organic carbon, comprising about 240K manual samples and 1.2M automated sensor readings. We used multiple, Poisson, or Tobit regression models to evaluate water quality before and after the WSP intervention. The compliance assessment analyzed exceedances of regulated, recommended, or operational water quality thresholds using chi-squared or Fisher’s exact tests. Poisson regression was used to examine acute gastroenteritis incidence rates in WSP-affected drinking water service areas relative to a comparison area. Implementation of a WSP generally resulted in unchanged or improved water quality, while compliance improved at most locations. Evidence for reduced acute gastroenteritis incidence following WSP implementation was found at only one of the three locations examined. Outcomes of WSPs should be expected to vary across large water utilities in developed nations, as the intervention itself is adapted to the needs of each location. The approach may translate to diverse water quality, compliance, and health outcomes.
(Final report at https://doi.org/10.1016/j.ijheh.2017.02.004)

Version 0
19. May 2016.
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by Luca Lucentini et al., 2014

Linee guida per la valutazione e gestione del rischio nella filiera delle acque destinate al consumo umano secondo il modello dei Water Safety Plans .

by Luca Lucentini et al., 2014

One decade ago, the World Health Organization recommended that water suppliers developed and implemented Water Safety Plans (WSP) as the most
effective mean to assure the quality of the water supply and the protection of the health of consumers. This model, as transposed in this guideline, consists of the overall risk assessment and risk management from catchment to tap, to protect the water to be destined to human consumption and the system, as well
as to control any process potentially affecting water quality, with the aim of assuring on a continuous way the absence of physical, biological and chemical hazards in drinking water. Risk based approach will also facilitate the flexibility of hazards management of emerging contaminants which are not systematically monitored, and /or vulnerabilities of water supply systems to direct and indirect impacts due to climate change. The guidance is addressed to water suppliers and health authorities as well as to all the stakeholders interested in different way to the drinking water quality. Criteria, methods and procedures are here provided in clear and practical terms to develop and implement WSP in drinking water supplies in Italy, independently by their dimension and by the volumes of supplied water.

Version 1
1. February 2011.
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by Frank Greaves and Claire Simmons , 01. February, 2011

Water Safety Plans for communities: guidance for adoption of water safety plans at community level

by Frank Greaves and Claire Simmons , 01. February, 2011

Numerous publications now exist on the formation and use of WSPs, but most of these focus on largerscale projects run by private or public utilities, commercial enterprises and international NGOs. Tearfund’s particular interest is in how WSPs can be understood and established by user communities which are faced with self-managing a water supply project to gain sustainable access to safe water quality. The guide is written chiefly for the use of a facilitator or facilitating body (eg the hygiene promoters or community mobilisers of a DMT or partner staff) to use in training community members, and in particular,the water project accountability group (eg Water Users Committee) of the community.

Version 1
1. November 2011.
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by World Health Organization et al., 01. November, 2011

Vietnam: Water safety plan

by World Health Organization et al., 01. November, 2011

Under AusAid funding, WHO supported WSP implementation in Vietnam. This case study highlights key WSP facts, and describes the water supply situation and regulation of WSP in Vietnam

Version 4
21. April 2016.
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by WHO, 2011

Guidelines for drinking-water quality (4th Ed. incorporating the first addendum) – ENGLISH

by WHO, 2011

The Guidelines for drinking-water quality is an authoritative basis for the setting of national regulations and standards for water safety in support of public health. It provides guidance on ways of implementing its recommendations of contextual hazard identification and risk management, including catchment-to-consumer water safety plans. The Guidelines position WSPs as a core element of the Framework for Safe Drinking-water and outline the principles and key elements of a WSP for policy-makers.

Version 1
21. April 2016.
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21. April, 2016

Urban water safety plan template for Bhutan

21. April, 2016

Provides a template WSP for urban water supply system in Bhutan based on the WSP manual. Contains text and tables as examples, which should be reviewed and revised to reflect system-specific conditions.

Version 1
5. March 2014.
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by EPA , 05. March, 2014

Climate Ready Water Utilities

by EPA , 05. March, 2014

Climate change is important to consider in all aspects of utility operations and planning because it can impact both the water resources as well as the infrastructure necessary to provide clean and safe water. The Climate Ready Water Utilities initiative is a practical and easy to use tool developed by EPA to assists the drinking water, waste water and stormwater utilities in understanding and addressing climate change risks and impacts as well as preparing operators systems’ for the impacts of climate change.

Version 2
21. April 2016.
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by IWA, 2007

Development and implementation of water safety plans for small scale supplies in Bangladesh: benefits and lessons learned

by IWA, 2007

This paper presents a case study from Bangladesh describing how WSPs can be developed and implemented for small systems. Model WSPs were developed through consultation with key water sector practitioners in the country. Simplified tools were developed to translate the formal WSPs into a format that was meaningful and accessible for communities to use.

Version 1
20. March 2014.
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by World Health Organization, 03. March, 2014

Water safety in distribution systems

by World Health Organization, 03. March, 2014

Water quality deterioration in distribution systems, mainly caused by inappropriate planning, design and construction or inadequate operation and maintenance and water quality control, has been linked to a significant proportion of the burden of waterborne and water-related illness. Stresses on these systems caused by rapid urbanization, population growth and aging infrastructure further exacerbates the problems. This reference tool has been developed to help water suppliers and regulators who are familiar with the Water Safety Plan approach, enhance their risk assessment and management and investment planning for their water distribution systems.

Version 1
26. May 2017.
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by Rory Moses McKeown, 26. May, 2017

WSP template for rural water supplies in Liberia

by Rory Moses McKeown, 26. May, 2017

This WSP template as been developed and customized specifically for use in rural water supplies in Liberia. Text in yellow provides an example of how to complete each section. This template may be considered for use in other countries and regions, but must first be reviewed and adapted to suit the local context.

Version 1
1. November 2011.
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by World Health Organization et al., 01. November, 2011

Bhutan: Water safety plan

by World Health Organization et al., 01. November, 2011

Under AusAid funding, WHO supported WSP implementation in Bhutan. This case study reports on key facts of the WSPs, and describes the status of water supply in Bhutan.

Version 1
26. July 2018.
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by Government of Nepal et al., 02. October, 2017

Climate Resilient Water Safety Plans Guideline: Rural Water Supply System

by Government of Nepal et al., 02. October, 2017

Based on international best practice and Nepal's Department of Water Supply & Sanitation experiences, these guidelines have been developed to support rural water supply schemes to development and implement an effective climate resilient WSP in rural settings.

 

Version 1
1. January 2009.
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by Lans Rosen and Andreas Kindhe , 2009

Comprehensive Framework for integrated risk management in WSP

by Lans Rosen and Andreas Kindhe , 2009

Risk assessment and risk prioritisation are critical elements of a Water Safety Plan. However the process can be complex, require considerable resources and take a long time. Therefore before establishing a risk management system it is important to be clear on the most cost effective approach to meet local priorities and needs. This document provides an overview of the TECHNEAU Generic Framework, which is a comprehensive structure for integrated risk management from catchment to consumer in Water Safety Plans, considering both water quality and water quantity

Version 2
28. September 2009.
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by MWH , 28. September, 2009

Consumer Acceptability Data Case Study: Yarra Valley Water, Australia

by MWH , 28. September, 2009

This case study provides an example of a water supplier in Australia which has undertaken research to understand consumer expectations in relation to water quality. This includes the use of surveys and focus groups. It also describes the approach the company takes to handling, recording, and reviewing complaints.

Version 1
5. October 2016.
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by WHO SEARO, 01. September, 2015

Water Safety Plans – Helping people in South Asia access safer, cleaner water

by WHO SEARO, 01. September, 2015

Information and advocacy brochure from WHO-SEARO briefly defining Water Safety Plans (WSPs), showing progress in WSP development in South East Asia Region, illustrating what WSPs deliver to suppliers and users and providing ideas on what stakeholders' next steps might be.

Version 1
24. August 2016.
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by WHO, 2012

Обеспечение безопасности питьевой воды в небольших коммунальных системах водоснабжения Поэтапное руководство по снижению рисков, связанных с системами водоснабжения в небольших населенных пунктах

by WHO, 2012

В «Руководстве ВОЗ по обеспечению качества питьевой воды» рекомендуется проведение комплексной оценки и мероприятий по снижению рисков для надежного обеспечения безопасности систем водоснабжения путем внедрения планов по обеспечению безопасности воды (ПОБВ). Это систематический, комплексный, экономически эффективный и применимый в самых различных обстоятельствах подход, который, таким образом, имеет важное значение для небольших коммунальных систем водоснабжения.

Цель данного руководства – помочь и оказать поддержку небольшим общинам в разработке и внедрении ПОБВ. Изложены шесть последовательных этапов, позволяющих разработать и внедрить ПОБВ. Следуя подходу, описанному в данном руководстве, небольшие общины могут усовершенствовать деятельность своих систем водоснабжения, чтобы добиться постепенных, устойчивых улучшений качества питьевой воды.

Version 1
11. May 2016.
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by WHO/IWA, 2009

Plans de gestion de la sécurité sanitaire de l’eau

by WHO/IWA, 2009

En 2004, les Directives de l'OMS pour la qualité de l'eau de boisson recommandaient que les fournisseurs d'eau potable développent et mettent en œuvre des plans de gestion de la sécurité sanitaire de l'eau (PGSSE) afin d'évaluer et de gérer systématiquement les risques.
Ce manuel répond à cette recommandation en décrivant de façon claire et en termes pratiques, comment développer et mettre en œuvre des plan de gestion de la sécurité sanitaire de l'eau. Onze modules de formation fournissent des conseils par étape. Chaque module présente une étape clé dans le processus de développement et de mise en application des plans de gestion de la sécurité sanitaire de l'eau.

Version 1
13. March 2024.
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by WHO, 15. February, 2024

Sanitary inspection packages – a supporting tool for the Guidelines for drinking water quality: small water supplies

by WHO, 15. February, 2024

This publication presents the World Health Organization’s (WHO’s) sanitary inspection packages. These packages update the sanitary inspection forms in WHO’s 1997 Guidelines for drinking-water quality. Volume 3: surveillance and control of community supplies. With more than 25 years of practical experience with the application of sanitary inspections, these packages have been developed from a comprehensive evidence review and established good practices.

Version 0
29. May 2017.
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by Mahmoud Abd Al Rahman Saad Mehany et al., 2016

WSP Status in Egypt

by Mahmoud Abd Al Rahman Saad Mehany et al., 2016

Egypt has accomplished the first draft of WSP at 2013, via cooperation between the Holding Company for Water and Wastewater and the VNG - International, this abstract represent the current situation of WSP in Egypt.

Version 1
21. February 2019.
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by David Sutherland et al., 29. August, 2017

Observations and lessons learnt from more than a decade of water safety planning in South-East Asia

by David Sutherland et al., 29. August, 2017

In many countries of the World Health Organization (WHO) South-East Asia Region, drinking water is not used directly from the tap and faecal contamination of water sources is prevalent. As reflected in Sustainable Development Goal 6, access to safer drinking water is one of the most successful ways of preventing disease. The WHO Water Safety Framework promotes the use of water safety plans (WSPs), which are structured tools that help identify and mitigate potential risks throughout a water-supply system, from the water source to the point of use. WSPs not only help prevent outbreaks of acute and chronic waterborne diseases but also improve water-supply management and performance. During the past 12 years, through the direct and indirect work of a water quality partnership supported by the Australian Government, more than 5000 urban and rural WSPs have been implemented in the region. An impact assessment based on pre- and post-WSP surveys suggests that WSPs have improved system operations and management, infrastructure and performance; leveraged donor funds; increased stakeholder communication and collaboration; increased testing of water quality; and increased monitoring of consumer satisfaction. These achievements, and their sustainability, are being achieved through national legislation and regulatory frameworks for water supply, including quality standards for drinking water; national training tools and extensive training of sector professionals and creation of WSP experts; model WSPs; WSP auditing systems; and the institution of longterm training and support. More than a decade of water safety planning using the WSP approach has shown that supplying safe drinking water at the tap throughout the WHO South-East Asia Region is a realistic goal.

Version 1
1. August 2009.
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by Bob Breach , 01. December, 2008

Emergency management plan checklist

by Bob Breach , 01. December, 2008

Preparation of a well documented and up to date emergency management plan is an essential component of an effective incident response framework. The structure and content can only be determined by each water supply taking account of a wide range of different local factors. However this document provides a checklist of those items which need to be considered.

Version 1
20. March 2024.
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by David Sheehan; Phillip Fasham; Rory Moses McKeown; Asoka Jayaratne, 01. December, 2023

Development of a tool to support operationalising water safety plans: experiences from a national water utility in Ghana

by David Sheehan; Phillip Fasham; Rory Moses McKeown; Asoka Jayaratne, 01. December, 2023

Since their incorporation into the 2004 version of the World Health Organization’s (WHO’s) Guidelines for Drinking Water Quality (GDWQ), Water Safety Plans (WSPs) continue to be the pre-eminent process for the delivery of safe drinking water to consumers. WSPs achieve this by prioritising proactive, rather than reactive, management of risks to drinking water quality. Since the use of WSPs was incorporated into the GDWQ, a range of supporting resources have been produced to assist water suppliers in preparing WSPs. Producing a robust WSP is an important first step in the management of risk, but in many cases, the implementation of WSPs presents significant challenges, particularly in relation to the implementation of Module 5 (implementing improvements) and Module 6 (monitoring of control measures). To address barriers to WSP implementation, the Ghana Water Company Limited (GWCL), in a peer-to-peer partnership with two Australian water utilities, developed a pilot WSP implementation strategy for one of the company’s drinking water supply systems. One of the outputs of the collaboration was the development of a framework for operationalising water safety planning, which incorporates basic guidance for embedding the WSP within routine operations, in order to ensure the safe management of drinking water.

Version 2
28. October 2008.
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by WSP, 28. October, 2008

Johannesburg, South Africa Case Study

by WSP, 28. October, 2008

This document describes the learnings from water safety plan development and implementation by Rand Water in South Africa, providing valuable field experiences from the process.

Version 1
4. March 2021.
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by World Health Organisation, 2021

Plans de gestion de la sécurité sanitaire de l’eau résilients au climat : Gestion des risques de santé liés à la variabilité et au changement climatiques.

by World Health Organisation, 2021

Ce guide présente l'état actuel des connaissances sur les effets des changements climatiques sur le cycle de l'eau ainsi que les impacts sanitaires associés. Il est destiné à aider les fournisseurs d'eau qui se sont engagés à utiliser ou qui utilisent déjà l'approche du Plan de Gestion de la Sécurité Sanitaire de l'Eau (PGSSE), à mieux comprendre les questions liées aux changements climatiques et à soutenir l'identifi cation et la gestion des risques liés aux changements climatiques dans le cadre du processus du PGSSE.

Le document aidera les professionnels du secteur, en particulier les fournisseurs d'eau et les équipes du PGSSE à identifi er et à intégrer les questions plus larges du changement climatique, de la réduction des risques de catastrophe (RRC) et de la gestion intégrée des ressources en eau (GIRE) en tant qu'approches contributives importantes au processus du PGSSE.

https://iwaponline.com/ebooks/book/812/Plans-de-gestion-de-la-securite-sanitaire-de-l-eau

 

 

Version 1
11. September 2017.
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by WHO, 11. September, 2017

Planifier la gestion de la sécurité sanitaire de l’eau pour l’approvisionnement en eau des petites communautés: Recommandations pour la gestion par étapes des risques liés à l’approvisionnement en eau potable des petites communautés

by WHO, 11. September, 2017

Les Directives de qualité pour l’eau de boisson de l’Organisation mondiale de la Santé recommandent l'application d'une approche d'ensemble pour l'évaluation et la gestion des risques appelée «Plans de gestion de la sécurité sanitaire de l'eau» afin d'assurer de la façon la plus efficace la sécurité des approvisionnements en eau. Cette approche est systématique, complète, rentable et adaptée à un large éventail de circonstances. Ainsi est-elle un outil important pour l'approvisionnement en eau des petites communautés.

Ce manuel a pour objet d’assurer la participation des communautés, de les rendre autonomes et de les guider dans l’élaboration et la mise en oeuvre de plans de gestion de la sécurité sanitaire de l’eau pour leurs réseaux d’eau de boisson.

Il présente des recommandations sur la façon de développer et de mettre en œuvre un PGSSE au moyen de 6 tâches réalisables. En suivant l'approche telle qu'elle est décrite dans ce manuel, les petites communautés peuvent améliorer la gestion de leur système d'approvisionnement et obtenir progressivement des améliorations durables de la qualité de l'eau potable.

Version 1
24. September 2010.
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by Talem Hasan and Federica Gerber , 24. September, 2010

The Economics of Drinking Water Safety Planning: An Advocacy Tool

by Talem Hasan and Federica Gerber , 24. September, 2010

This paper describes an economic cost-benefit analysis of the Koror-Airai drinking water safety plan from Palau to demonstrate the value to society of the drinking water safety planning approach in the long term. The cost-benefit analysis for implementing the Koror-Airai drinking water safety plan showed that a return of US$ 6.00 was expected on every US$ 1.00 invested towards implementing the plan. The case study provides an effective advocacy tool for the promotion of drinking water safety planning both in the Pacific region and globally.

Version 1
19. May 2016.
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by Angella Rinehold (WHO et al., 25. August, 2015

Rural WSP template for Sri Lanka

by Angella Rinehold (WHO et al., 25. August, 2015

This resource provides a template for a WSP for a rural community in Sri Lanka which has been customized and tailored to the local context through a pilot programme.
Important note - This template should be adapted and trialed before being used in a different context.

Version 1
20. March 2010.
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by WHO, 01. March, 2010

Water safety plans: managing drinking-water quality for public health

by WHO, 01. March, 2010

A brief note on the rationale for the WSP approach, the potential benefits for various stakeholder groups, and the value of incorporating WSPs into policies and regulations.

Version 1
2. January 2011.
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by Engeeners Without Borders Australia , 02. January, 2011

SNAKES & LADDERS – Water Safety Plan version in Nepal

by Engeeners Without Borders Australia , 02. January, 2011

‘WSP Snakes & Ladders’ was developed according to the hazards identified and hazard control measures developed for this particular community in Nepal. The game could easily be adapted to any drinking water system or community, ensuring that the hazards and control measures are locally appropriate.

Version 1
2. December 2007.
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by U.S. Department of Health and Human Services Centers for Disease Control and Prevention National Center for Environmental Health Agency for Toxic Substances and Disease Registry Division of Emergency and Environmental Health Services , 02. December, 2007

Household Water Use and Health Survey for the WSP Linden Guyana

by U.S. Department of Health and Human Services Centers for Disease Control and Prevention National Center for Environmental Health Agency for Toxic Substances and Disease Registry Division of Emergency and Environmental Health Services , 02. December, 2007

This Household Water Use and Health Survey was therefore conducted as part of the Water Safety Plan for Linden, Guyana in order to understand the fate of water from the time it reaches the home to the point of consumption. It illustrates the sampling, the household visits, the water testing, the data management and discusses the results from the survey.

Version 1
16. May 2019.
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01. May, 2019

Strategic Recommendations for Climate Smart Water Utilities: Using the Flood and Drought Portal in Planning

01. May, 2019

The effect of climate change on the hydrological cycle is becoming a growing phenomenon and resulting in impacts including flood and drought events, disappearance of glaciers, decrease in groundwater recharge, and water quality degradation (e.g. oxygen depletion in water reservoirs during extreme heat events) (WHO, 2017).

Such events are becoming increasingly common, more severe and less predictable with increasing climate variability and change. Stakeholders from catchment to tap have a role to play in strengthening climate resilience. Water utilities, in particular, need to have sustainable and resilient water resources management to ensure water supply continuity and to fulfill their responsibility to deliver safe and secure water to their customers.

This document focuses on strategic recommendations for water utilities on:

  1. Why and how water utilities can integrate climate change impacts into planning and management of water resources, specifically through WSPs; and
  2. How to use the Flood and Drought Portal (www.flooddroughtmonitor.com), to better include climate data and information into WSP, ensuring its climate resilience

Version 2
17. August 2023.
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17. August, 2023

Water safety plan template for hospitals in Hong Kong (English)

17. August, 2023

In conjunction with the Guidelines for Drinking Water Safety Plans for Buildings in Hong Kong, this template is prepared incorporating input from facility managers of hospitals for management staff to develop and implement Water Safety Plan to enhance water safety in hospitals.

Version 1
18. August 2017.
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by World Health Organization, 14. August, 2017

Potable reuse: Guidance for producing safe drinking-water

by World Health Organization, 14. August, 2017

In response to growing pressures on available water resources, potable reuse represents a practical source of drinking-water in many circumstances.

This document describes how to apply appropriate management systems to produce safe drinking-water from municipal wastewater. Information is provided on specific aspects of potable reuse, including the quality and protection of source wastewaters, types of control measures, monitoring considerations and public acceptance. Application of potable reuse is also illustrated through a number of case studies.

The guidance is intended for use by drinking-water suppliers and regulators who are familiar with the WHO’s Guidelines for drinking-water quality and, in particular, the framework for safe drinking-water, including water safety plans. This publication may also be useful to others with an interest in potable reuse including environmental health and water resource professionals.

Version 1
1. September 2009.
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by Department of health Victoria et al., 2011

Case Study on Water Safety Plan Implementation and Lessons Learned: WSP auditing Victoria Australia

by Department of health Victoria et al., 2011

This case study describes the implementation of WSP and lessons learned in Victoria Australia. This case study has a specific focus on auditing WSPS.

Version 1
1. August 2009.
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by MWH , 01. August, 2009

Conducting consumer surveys of water acceptability

by MWH , 01. August, 2009

Communication with consumers is a key part of assessing and promoting the acceptability of drinking water supplies with consumers. The evaluation of consumer acceptability and knowledge of consumer complaints are important components of assessing the overall effectiveness of a WSP and an essential part of the verification of a WSP. This document summarises the main approaches to the collection and analysis of consumer acceptability through surveys.

Version 1
1. September 2007.
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by Therrence Thompson et al., 01. September, 2007

Chemical safety of drinking-water: Assessing priorities for risk management

by Therrence Thompson et al., 01. September, 2007

This text provides guidance on the chemical safety of drinking-water. Chemical contaminants of drinking-water are often considered a lower priority than microbial contaminants, because adverse health effects from chemical contaminants are generally associated with long-term exposures, whereas the effects from microbial contaminants are usually immediate. Nonetheless, chemicals in water supplies can cause very serious problems. The objective of this text is to help users at national or local level to establish which chemicals in a particular setting should be given priority in developing strategies for risk management and monitoring of chemicals in drinking-water. The document will be useful to public health authorities, those responsible for setting standards and for surveillance of drinking-water quality, and to water supply agencies responsible for water quality management. In particular, this publication will be applicable in settings where information on actual drinking-water quality is limited, which is the case in many developing countries and in rural areas of some developed countries.

Version 2
1. August 2009.
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by Bob Breach , 01. August, 2009

Intermittent supplies and water quality

by Bob Breach , 01. August, 2009

This document highlights water quality risks from supplies that do not continuously supply water and outlines examples of measure to control these risks.

Version 2
1. August 2009.
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by Bob Breach , 01. August, 2009

Treated water storage

by Bob Breach , 01. August, 2009

This document summarises the type of risks that might occur within treated water storages and how to control them.

Version 2
1. November 2010.
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by Federica Gerber et al., 01. November, 2010

An Economic Assessment of Drinking Water Safety PlanningKoror-Airai, Palau

by Federica Gerber et al., 01. November, 2010

This document describes a preliminary economic assessment of the Koror-Airai, Palau drinking water safety plan. The information generated is to be used to inform stakeholders in Palau of the rewards from supporting the DWSP approach, demonstrating the potential benefits of investing in the Plan.