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 2020–December 2020.
| Pamela Abbott | Fabiane Dorr | Paul Hunter | Jussi Meriluoto | Hamidreza Safavi |
| Sawsan Abd El Samie | Stéphanie Dos Santos | Ahmed Hussein | John Scott Meschke | Ricardo Santos |
| Lucia Abel | Önder Düzlü | Masaru Ihara | Haroon Mian | Jun Sasaki |
| Augustine Afullo | Mawuli Dzakpasu | Jong Kwon Im | Giovanni Milanez | Shray Saxena |
| Bahaa Ahmed | James Ebdon | James Imlay | Harvey Minnigh | Jack Schijven |
| Warish Ahmed | Aniekan Edet | Hiroaki Ito | Yogendra Mishra | Mary Schoen |
| Zahraa Alaali | Nasreldin Elhadi | Sadahiko Itoh | Takayuki Miura | Arsalan Sepehri |
| Abayomi Alayande | Walid Elmonir | Tim Julian | Taro Miyoshi | Dai Shimazaki |
| Absar Alum | Stephen Estes-Smargiassi | Panagiotis Karanis | Tadao Mizuno | Kazuya Shimizu |
| Mohan Amarasiri | Craig Evans | Sabrina Binti Karim | Josino Moreira | Nobutaka Shirasaki |
| Maria Cristina Angelici | Joseph Falkinham | Lilian Karla de Oliveira | Hazel Mufhandu | Sadhana Shrestha |
| Yasuhiro Asada | John Fawell | Ikuro Kasuga | Maite Muniesa | Celalettin Şimşek |
| J. Fernando Ayala-Zavala | Fulvio Ferrara | Tsuyoshi Kato | Heather Murphy | Ryan Sinclair |
| Sung Woo Bae | Jay Fleisher | Shinobu Kazama | Norihide Nakada | Robin Slawson |
| Carolina Baeza | Colin Fricker | Emma Kelly | Tomohiro Nakanishi | Charlotte Smith |
| Susan Bagley | Samuel Fuhrimann | Bruce Keswick | Josef Novotný | Samuel Snow |
| Mehdi Bahrami | Megumu Fujibayashi | Amy Kirby | Ify Nwaogazie | Maronel Steyn |
| Xiaohui Bai | Manabu Fujii | Masaaki Kitajima | Kumiko Oguma | Timothy Straub |
| Arnold Bainomugisa | Takahiro Fujioka | Ivana Klun | Yumiko Ohkouchi | Kazuki Sugawara |
| Katherine Baker | Taku Fujiwara | Kalmia Kniel | Tsutomu Okubo | Yuji Suzuki |
| Paulo Barrocas | Toshikazu Fukushima | Tamar Kohn | Serra Olvare | Brooke Swaffer |
| Ayslan Barros | Miyu Fuzawa | Yukako Komaki | Jerry Ongerth | Tomoko Takaara |
| Peter Belenky | Maria Galeano | Koji Kosaka | Gideon Oron | Yugo Takabe |
| Sylvia Benjamin | Rebecca Gast | Frantisek Kozisek | Mamoru Oshiki | Fumihiko Takeda |
| Aaron Bivins | Richard Gelting | Leigh-Anne Krometis | Simon Otto | Shuhei Tanaka |
| Myriam Bormans | B Genthe | Paweł Krzyściak | Long Pan | Sarmila Tandukar |
| Dweight Bowman | Charles Gerba | Kengo Kubota | Alison Parker | Abbas Tcharkhtchi |
| Joao Brandao | Brent Gilpin | Amit Kumar | Gissela Pascual | Jacquie Thomas |
| John Brooks | Ryota Gomi | Rudresh Kumar | Gissela Pascual Pariona | Ilias Tirodimos |
| Joe Brown | Eline Gonçalves | Jesus Lacarte | Paula Paulo | Şeref Turhan |
| Mutlu Sönmez Çelebi | Panagiota Gousia | Daniele Lantagne | Genandrialine Peralta | Sital Uprety |
| Muazzez Çelik Karakaya | Wilhelm Grabow | Anna Lass | Robert W. Peters | Taro Urase |
| Leonardo Cerasino | Neil Grigg | Suntae Lee | Songkeart Phattarapattamawong | Masaru Usui |
| Mario Cerroni | Vera Guarda | Jonas Levêque | Gregory Pierce | Vedat Uyak |
| Cristobal Chaidez | Maria Gunnarsdottir | Qiang Li | Natasha Potgieter | Timothy Wade |
| Deborah Chapman | Saurabh Gupta | Gerardo Lopez | Musa Pudza | Nicole Wagner |
| Marina Charykova | Kerry Hamilton | Israel Lopez-Prieto | Antonio Pulido Bosch | Toru Watanabe |
| Kwok Wing Chau | Hidenori Harada | Jacob Lorenzo-Morales | Sarah Purnell | Astrid Wester |
| Mei-Fang Chien | Eiji Haramoto | Fernando J. Magalhães Filho | Abdel-Fattah Qaraman | Amber Wutich |
| Emmanuel Chubaka | Ayumi Hashiguchi | Naji Mahat | Irfan Rashid | Liqiang Xie |
| Joseph Cook | Akihiko Hata | Mohammad Reza Mahmoudi | Surapong Rattanakul | Like Xu |
| Jennifer Cooper | Kai He | Amir Hosein Mahvi | Maria Tereza Pepe Razzolini | Edna Yamasaki |
| Angela Coulliette-Salmond | Ayala Herath | Marcelo Mandile | Maria Riquelme | Tao Yan |
| Gunther Craun | Wim Hijnen | Isabella Marchesi | Katharine Robb | Masoud Yavarmanesh |
| Dongjuan Dai | Hiroshi Hirotani | Jason Marion | Marilyn Roberts | Mahmood Yousefi |
| Miles Daniels | Rochelle Holm | Yoshifumi Masago | Vincenzo Romano Spica | Jin-Gang Yu |
| Purnamita Dasgupta | Ryo Honda | Frederick Masangkay | Carlos Rosa | Gernot Zarfel |
| Sabino De Gisi | Pei-Ying Hong | Taku Matsushita | David Roser | Qian Zhang |
| Digbijoy Dey | Bilqis Hoque | Athena Mavridou | Siddhartha Roy | Xiangru Zhang |
| Moussa Djaouda | Kurt Houf | Gertjan Medema | Hodon Ryu | Yanlai Zhou |
| Sina Dobaradaran | Kevin Hunt | Kristina Mena | Hamid Safarpour | Alyaa M. Zyara |