{"id":9293,"date":"2026-06-17T16:06:05","date_gmt":"2026-06-17T16:06:05","guid":{"rendered":"https:\/\/godshand.link\/ground_post\/guidelines-for-drinking-water-quality-fourth-edition-incorporating-the-first-second-and-third-addenda\/"},"modified":"2026-06-17T16:06:05","modified_gmt":"2026-06-17T16:06:05","slug":"guidelines-for-drinking-water-quality-fourth-edition-incorporating-the-first-second-and-third-addenda","status":"publish","type":"ground_post","link":"https:\/\/godshand.link\/en_gb\/ground_post\/guidelines-for-drinking-water-quality-fourth-edition-incorporating-the-first-second-and-third-addenda\/","title":{"rendered":"Guidelines for drinking-water quality: fourth edition incorporating the first, second and third addenda"},"content":{"rendered":"<p><br \/>\n<\/p>\n<section class=\"dynamic-content__section dynamic-content__container\">\n<div class=\"dynamic-content__section-container\">\n<div class=\"dynamic-content__figure-container\">\n<figure class=\"dynamic-content__figure\">\n      <img decoding=\"async\" src=\"https:\/\/iris.who.int\/server\/api\/core\/bitstreams\/23a40bc2-d8c6-4aa4-a8b4-5a7a359a8653\/content\" alt=\"Guidelines for drinking-water quality: fourth edition incorporating the first, second and third addenda\"><br \/>\n     <\/figure>\n<div class=\"button button-blue-background\"><a target=\"_blank\" href=\"https:\/\/iris.who.int\/server\/api\/core\/bitstreams\/c60cc28e-defe-45ed-b157-71fdd43902bf\/content\" onclick=\"sendGaEvent('Download','https:\/\/iris.who.int\/server\/api\/core\/bitstreams\/c60cc28e-defe-45ed-b157-71fdd43902bf\/content')\">Download <span>(6 MB)<\/span><\/a><\/div><\/div>\n<div class=\"dynamic-content__description-container\">\n<div class=\"row\">\n<div class=\"col-md-8\">\n<div class=\"dynamic-content__description\">\n<h3>Overview <\/h3>\n<p>The fourth edition incorporating the first, second, and third addenda of the World Health Organization\u2019s (WHO) <em>Guidelines for drinking-water quality<\/em> (GDWQ) builds on over 65 years of WHO guidance on drinking-water quality. This guidance has formed an authoritative basis for the setting of national regulations and standards for water safety in support of public health.<\/p>\n<p>The Guidelines provide a comprehensive framework for protecting public health through the management of drinking-water quality risks, from catchment to consumer. They support the development of health-based targets, risk-based management approaches and independent surveillance.<\/p>\n<p>This latest version incorporates updates that reflect new evidence and substantive implementation experience to better support the effective application of the Guidelines in a range of settings.<\/p>\n<h3><strong>What is new?<\/strong><\/h3>\n<p>Key updates in this version include:<\/p>\n<ul>\n<li>clearer recognition that small water supplies need explicit consideration in policies and regulations, along with appropriate support for implementation;<\/li>\n<li>strengthened emphasis on the role of governments in supporting risk management by water suppliers, including through water safety plans and sanitary inspections;<\/li>\n<li>updated guidance on water safety plans and sanitary inspections, drawing on additional experience in development and implementation;<\/li>\n<li>new or updated matrices to support prioritization of action and progressive improvement based on results from both microbial water quality tests and assessment of water suppliers\u2019 risk management practices;<\/li>\n<li>updated information on microbial pathogens, including revised pathogen-specific fact sheets and summary tables;<\/li>\n<li>updated information on pesticides used for vector control in drinking-water, reflecting WHO\u2019s latest guidance; and<\/li>\n<li>additional references to WHO resources to support implementation, including guidance on small water supplies, sanitary inspections, lead in drinking-water and cyanobacteria management.<\/li>\n<\/ul>\n<p>More details on the updates are included in the GDWQ preface. A companion summary note  provides further detail on the main changes.<\/p>\n<div>\n<div>\n<div id=\"_com_1\" language=\"JavaScript\">\n<p><span style=\"background-color:transparent;font-size:18px;font-weight:700;text-align:inherit;word-spacing:normal;caret-color:auto;white-space:inherit;\">\u00a0<\/span><\/p>\n<p><span style=\"background-color:transparent;font-size:18px;font-weight:700;text-align:inherit;word-spacing:normal;caret-color:auto;white-space:inherit;\">Read individual chapters<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_introduction.pdf?sfvrsn=ceef8f94_5\">Introduction<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_a-conceptual-framework.pdf?sfvrsn=c23269ba_5\">A conceptual framework for implementing the Guidelines<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_health-based-targets.pdf?sfvrsn=2c5ff12f_5\">Health-based targets<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_water-safety-plans.pdf?sfvrsn=216e2592_5\">Water safety plans<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_surveillance.pdf?sfvrsn=36d65a14_5\">Surveillance<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_application-of-the-guidelines.pdf?sfvrsn=9b3a4a7e_5\">Application of the Guidelines in specific circumstances<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_microbial-aspects.pdf?sfvrsn=f26fb85b_5\">Microbial aspects<br data-sf-ec-immutable=\"\"><\/a><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_chemical-aspects.pdf?sfvrsn=dc5e51fc_5\">Chemical aspects<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_radiologial-aspects.pdf?sfvrsn=8740a61_5\">Radiological aspects<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_acceptability-aspects.pdf?sfvrsn=53c0eac8_5\">Acceptability aspects: taste, odour and appearance<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_microbial-fact-sheets.pdf?sfvrsn=4a7bc4c7_5\">Microbial fact sheets<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_chemical-fact-sheets.pdf?sfvrsn=77d972e1_5\">Chemical fact sheets<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_ann-1-supporting-documentation.pdf?sfvrsn=93801595_3\">Annex 1: Supporting documentation to the Guidelines<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third_addenda_ann-2-references.pdf?sfvrsn=6241b0cb_5\">Annex 2: References cited<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_ann-3-chemical-summary-tables.pdf?sfvrsn=d834e6a9_5\">Annex 3: Chemical summary tables<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_ann-4-analytical-methods.pdf?sfvrsn=1cfadac7_5\">Annex 4: Analytical methods and achievability<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_ann-5-treatment-methods.pdf?sfvrsn=5f033730_5\">Annex 5: Treatment methods and performance<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_ann-6-supporting-information-on-radionuclides.pdf?sfvrsn=de1a22ba_5\">Annex 6: Supporting information on radionuclides<\/a><br \/><a target=\"_blank\" href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/water-safety-and-quality\/dwq-guidelines-4\/gdwq_4ed_with_third-addenda_ann-7-contributors73a16c0f-2318-491e-bf91-fdd57881717d.pdf?sfvrsn=6f95601b_5\">Annex 7: Contributors to the development of the Guidelines for drinking-water quality: fourth edition incorporating the first, second and third addenda<\/a><\/p>\n<div id=\"dynamic-content__accordion\" class=\"dynamic-content__accordion\">\n<h3>Related links<\/h3>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/news\/item\/18-06-2026-who-unveils-third-addendum-to-guidelines-for-drinking-water-quality\">Read the news story: WHO unveils Third addendum to guidelines for drinking-water quality<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/publications\/m\/item\/drinking-water-quality--a-roadmap-to-supporting-resources\">Drinking-water quality: a roadmap to supporting resources<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/publications\/i\/item\/9789240088740\">Guidelines for drinking-water: small water supplies<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/publications\/i\/item\/9789240089006\">Sanitary inspection packages: a supporting tool for the Guidelines for drinking-water quality: small water supplies<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/teams\/environment-climate-change-and-health\/water-sanitation-and-health\/chemical-hazards-in-drinking-water\">View the list of chemical hazards considered in the WHO Guidelines for drinking-water quality<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/teams\/environment-climate-change-and-health\/water-sanitation-and-health\/burden-of-disease\/water-sanitation-hygiene-microbial-pathogens\">View the list of WASH-related pathogen background documents<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/publications\/i\/item\/9789241549950\">Previous editions of the Guidelines for drinking-water quality (including French and Spanish versions of the fourth edition incorporating the first addendum and Russian, Chinese and Japan versions of the fourth edition<\/a>)<\/p>\n<h3>Social media tiles<\/h3>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/multi-media\/details\/1-in-4-people-still-lack-safe-drinking-water\">1 in 4 people still lack safe drinking-water<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/multi-media\/details\/who-launches-the-3rd-addendum\">WHO launches the 3rd addendum<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/multi-media\/details\/why-it-matters\">Why it matters<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/multi-media\/details\/what-is-new-in-the-guidelines\">What is new in the Guidelines<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/multi-media\/details\/support-for-countries\">Support for countries<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.who.int\/multi-media\/details\/support-for-implementation\">Support for implementation<\/a><\/p>\n<\/p><\/div><\/div><\/div>\n<div class=\"col-md-4\">\n<div class=\"dynamic-content__details\">\n<div class=\"detail who-team\">\n<div class=\"label\">WHO Team<\/div>\n<div class=\"value\">\n                 <span><br \/>\n                             <a target=\"_blank\" href=\"https:\/\/www.who.int\/teams\/environment-climate-change-and-health\">Environment, Climate Change, OneHealth, Migration (ECO)<\/a>,                  <\/span><br \/>\n                 <span><br \/>\n                             <a target=\"_blank\" href=\"https:\/\/www.who.int\/teams\/environment-climate-change-and-health\/water-sanitation-and-health\">Water, Sanitation, Hygiene and Health (WSH)<\/a>                 <\/span>\n         <\/div><\/div>\n<div class=\"detail\">\n<div class=\"label\">Editors<\/div>\n<div class=\"value\">World Health Organization<\/div><\/div>\n<div class=\"detail\">\n<div class=\"label\">Number of pages<\/div>\n<div class=\"value\">647<\/div><\/div>\n<div class=\"detail\">\n<div class=\"label\">Reference numbers<\/div>\n<div class=\"value\">\n<div><strong class=\"label-sm\">ISBN: <\/strong><span>978-92-4-012122-5<\/span><\/div><\/div><\/div>\n<div class=\"detail\">\n<div class=\"label\">Copyright<\/div>\n<p>                <a target=\"_blank\" class=\"creativecommons-icons-wrappers\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/igo\/deed.en\" rel=\"license\" title=\"Click here to see the details of CC BY-NC-SA 3.0 IGO\"><br \/>\n                        <img decoding=\"async\" src=\"https:\/\/www.who.int\/ResourcePackages\/WHO\/assets\/icons\/cc-icons\/cc.svg\"><br \/>\n                        <img decoding=\"async\" src=\"https:\/\/www.who.int\/ResourcePackages\/WHO\/assets\/icons\/cc-icons\/by.svg\"><br \/>\n                        <img decoding=\"async\" src=\"https:\/\/www.who.int\/ResourcePackages\/WHO\/assets\/icons\/cc-icons\/nc.svg\"><br \/>\n                        <img decoding=\"async\" src=\"https:\/\/www.who.int\/ResourcePackages\/WHO\/assets\/icons\/cc-icons\/sa.svg\"><br \/>\n                <\/a>\n        <\/div><\/div><\/div><\/div><\/div><\/div>\n<\/section>\n<p><br \/>\n<br \/><a href=\"https:\/\/www.who.int\/publications\/i\/item\/9789240121225?rand=6398\" target=\"_blank\">Source link <\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Download (6 MB) Overview The fourth edition incorporating the first, second, and third addenda of the World Health Organization\u2019s (WHO) Guidelines for drinking-water quality (GDWQ) builds on over 65 years of WHO guidance on drinking-water quality. This guidance has formed an authoritative basis for the setting of national regulations and standards for water safety in support of public health. The&hellip;<\/p>","protected":false},"author":99035,"featured_media":9294,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"give_campaign_id":0,"footnotes":""},"tags":[2752,1427,657,2750,666,2751,783],"ground_category":[315,316],"class_list":["post-9293","ground_post","type-ground_post","status-publish","format-standard","has-post-thumbnail","hentry","tag-addenda","tag-drinkingwater","tag-edition","tag-fourth","tag-guidelines","tag-incorporating","tag-quality","ground_category-2-grounds-tribulation","ground_category-2-1-time-disease"],"fifu_image_url":"https:\/\/iris.who.int\/server\/api\/core\/bitstreams\/23a40bc2-d8c6-4aa4-a8b4-5a7a359a8653\/content","_links":{"self":[{"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/ground_post\/9293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/ground_post"}],"about":[{"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/types\/ground_post"}],"author":[{"embeddable":true,"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/users\/99035"}],"replies":[{"embeddable":true,"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/comments?post=9293"}],"version-history":[{"count":0,"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/ground_post\/9293\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/media\/9294"}],"wp:attachment":[{"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/media?parent=9293"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/tags?post=9293"},{"taxonomy":"ground_category","embeddable":true,"href":"https:\/\/godshand.link\/en_gb\/wp-json\/wp\/v2\/ground_category?post=9293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}