The high scientific standards maintained by Journal of Water and Health in its papers owe much to the continuing dedication of the journal's reviewers, who give freely of their time and expertise. IWA Publishing is pleased to pay tribute to this contribution by recognizing those who have participated in the review process. Thus, the Editors of Journal of Water and Health acknowledge with particular gratitude the following reviewers who have reviewed papers during the period January 2019–December 2019.
| Pamela Abbott | Patrizia De Filippis | Paul Hynds | Takayuki Miura | Dai Shimazaki |
| Lucia Abel | Digbijoy Dey | Masaru Ihara | Taro Miyoshi | Nobutaka Shirasaki |
| John Abraham | Rafik Dey | Hiroaki Ito | Tadao Mizuno | Sadhana Shrestha |
| Rafiq Ahmad | Lauren Dmello-Guyett | Sadahiko Itoh | Maggy Momba | Ryan Sinclair |
| Warish Ahmed | Sina Dobaradaran | Greg Jackson | Susan Murcott | Kwanrawee Sirikanchana |
| Kabir Akinyemi | Samuel Dorevitch | Tim Julian | Douglas Mushi | Patrick Smeets |
| Abayomi Alayande | Mawuli Dzakpasu | Motoyuki Kamata | Norihide Nakada | Lauren Steinbaum |
| Absar Alum | Artemis Efstratiou | Lilian Karla de Oliveira | Tomohiro Nakanishi | Thor Axel Stenstrom |
| Mohan Amarasiri | Markus Egert | Tsuyoshi Kato | Kazunori Nakano | Maronel Steyn |
| Maria Cristina Angelici | Khaled El-Gayar | David Kay | José Navarro Pedreño | Timothy Straub |
| Alberto Antonelli | Joseph Falkinham | Shinobu Kazama | Ify Nwaogazie | Brooke Swaffer |
| Benjamin Arnold | John Fawell | Emma Kelly | Kumiko Oguma | Tomoko Takaara |
| Yasuhiro Asada | Giuliana Ferrero | Patiya Kemacheevakul | Yumiko Okochi | Fumihiko Takeda |
| Nicholas Ashbolt | Mª Jose Figueras | Bruce Keswick | Serra Olvare | Wayne Teel |
| Daniel Axelrad | Hans Curt Fleming | Naveed Khan | Gregory O'Mullan | Mitsuharu Terashima |
| J. Fernando Ayala-Zavala | Timothy Foster | Sayeed Khatib | Mamoru Oshiki | Yasumasa Tojo |
| Sung Woo Bae | Samuel Fuhrimann | Julie Kinzelman | Joanne O'Toole | Gary Toranzos |
| Carolina Baeza | Manabu Fujii | Gorkem Kismali | Alison Parker | Simoni Triantafyllidou |
| Angelo Baggiani | Toshikazu Fukushima | Masaaki Kitajima | Paula Paulo | Hristos Tyralis |
| Emily S. Bailey | Karin Gallandat | Yukako Komaki | Genandrialine Peralta | Hidetoshi Urakawa |
| Katherine Baker | Victor Gannon | Koji Kosaka | Kelsey Pieper | Ken Ushijima |
| Patricia Barril | Daniel Gerrity | Frantisek Kozisek | Sarah Purnell | Vedat Uyak |
| Stavros Bashiardes | Lucia Ghietto | Paweł Krzyściak | Geoffrey Puzon | Meysam Vadiati |
| Abdallah Bashir | Antonio Gil | Kengo Kubota | Vladimir Radosavljević | Meine Pieter van Dijk |
| Sylvia Benjamin | Eline Gonçalves | Rudresh Kumar | Mohammad Rafiee | James VanDerslice |
| Walter Betancourt | David Gordon | Tokihiro Kurita | Juluri Rao | Stephanie Velegol |
| Sanchita Bhadra | Wilhelm Grabow | Iain Lake | Surapong Rattanakul | Matthew Verbyla |
| Enver Baris Bingol | Neil Grigg | Aparna Lal | Brian Reed | Jasmina Vidic |
| Aaron Bivins | Veera Gude | Byung Lee | Andrew Reich | Mariana Villasboas |
| Sara Bonetta | Maria Gunnarsdottir | Sun Tae Lee | Geeta Rijal | Julia Walochnik |
| Paola Borella | Patrick Gurian | Jonas Levêque | Lucy Robertson | Ding Wang |
| Albert Bosch | Sepideh Hakim Elahi | Erin Ling | Mario Rodrigues Peres | Yin Wang |
| Lori Bradford | Kerry Hamilton | Jacob Lorenzo-Morales | Vincenzo Romano Spica | Toru Watanabe |
| John Brooks | Hidenori Harada | Fernando J. Magalhães Filho | David Roser | Ivan Wawrzyniak |
| Milena Bruno | Eiji Haramoto | Angela Magnet | Asher Rosinger | Susan Weir |
| Annalaura Carducci | Ayumi Hashiguchi | Naji Mahat | Marta Rusiñol | David Wendell |
| Lisa Casanova | Takashi Hashimoto | Mohammad Reza Mahmoudi | Hodon Ryu | Juliet Willetts |
| Cristobal Chaidez | Akihiko Hata | Leszek Majewski | Lyda Patricia Sabogal-Paz | Sakiko Yaegashi |
| Deborah Chapman | Richard Haugland | Marcelo Mandile | Soutarou Sadahiro | Hiroshi Yamamura |
| Katrina Charles | Kai He | Jason Marion | Madhi Sadeghi (Kargar) | Jonathan Yoder |
| Sylvia Checkley | Christina Hecht | Joaquín Márquez-Rodríguez | Hiroshi Sakai | Keunje Yoo |
| Xia Chen | Ayala Herath | Pedro Martínez Santos | Hercules Sakkas | Otsuka Yoshiomi |
| Mei-Fang Chien | Wim Hijnen | Yoshifumi Masago | Ricardo Santos | Candice Young-Rojanschi |
| David C. Coleman | Nynke Hofstra | Frederick Masangkay | Hisashi Satoh | Qiang Yu |
| Felipe de Jesus Colon Gonzalez | Ryo Honda | Taku Matsushita | Marion Savill | Ali Zarei Baygi |
| Cristian Coman | Pei-Ying Hong | Athena Mavridou | René Peter Schneider | Qian Zhang |
| Angela Coulliette-Salmond | Ariful Hoque | Graham McBride | Michael Schock | Xiangru Zhang |
| Gunther Craun | Bilqis Hoque | David McCarthy | Mary Schoen | Tara Zolnikov |
| David Cunliffe | Guanghui Hua | Margaret Menoch | David Schwake | |
| Miles Daniels | Luke Huggins | Harvey Minnigh | Arsalan Sepehri |