The high scientific standards maintained by Water Policy 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 Water Policy acknowledge with particular gratitude the following reviewers who have reviewed papers during the period January 2019–December 2019.
| Pamela Abbott | Yao-Ming Chu | MinFei Jian | Sacchidananda Mukherjee | Larry Swatuk |
| Vicenç Acuña | Il-Moon Chung | Yong Jiang | Ramakrishna Nallathiga | Geoffrey Syme |
| Angelos Alamanos | Zoran Ciric | Mohamed Kahil | Vishal Narain | Pierre Teniere Buchot |
| Henry Alhassan | Elif Colakoglu | Jonghun Kam | A. Narayanamoorthy | Guiliang Tian |
| Tony Allan | Lin Crase | Vasilis Kanakoudis | Daniel Narzetti | Philamer Torio |
| Lal Almas | James Creighton | David Katz | Grey Nearing | Julie Trottier |
| Hussein Amery | Bowman Cutter | Vimal Khawas | Susana Neto | Vasilios Tzanakakis |
| Jayanath Ananda | Xiaoping Dai | Anthony Kiem | Guangheng Ni | Hita Unnikrishnan |
| Sarah Anderson | Keshab Das | Judith Klostermann | Ioannis Nikolaou | Mohammad Valipour |
| A. N. Angelakis | Robert de Loe | Elizabeth Koebele | Rodrigo Oliveira | Elena Vallino |
| Ann Arnold | Jerome Delli Priscoli | Antonis Kolimenakis | Mariya Pak | Pieter van Beukering |
| Jose Luis Arumi | Qingyun Du | Ioannis Kostakis | Daeryong Park | Caroline van den Berg |
| Brice Auvet | Yuneng Du | Wolfgang Kron | Helga Pereira | Tom van der Voorn |
| Sedat Ayanoglu | Mark Elliott | Suren Kulshreshtha Kulshreshtha | Jeanne Perrier | Pieter Van der Zaag |
| Roger W. Bachmann | Kwame Emmanuel | Zbigniew Kundzewicz | Kenneth M. Persson | Gerardo van Halsema |
| Kenneth A. Baerenklau | Bert Enserink | Sriranjan Lacoul | Gregory Pierce | Paul van Hofwegen |
| Chandra Bahinipati | Encarna Esteban | Nelly Leblond | João Pires | Claudia Vargas |
| Claudia Baldwin | Thalita Fagundes | Kees Leendertse | Mary Pitts | Laura Vargas |
| Somnath Bandyopadhyay | David Feldman | Ti Le-Huu | Sandhya Rao Poleneni | L. Venkatachalam |
| Alexandro Barbosa | Sara Fernandez | Mingliang Li | Gheorghe Ponta | Jean Verdier |
| Anamika Barua | Diogo Ferreira | Peiyue Li | Ioana Popescu | Joshua Viers |
| Nitin Bassi | Coleen Fox | Ed Link | Anjal Prakash | Ratna Reddy Vippala |
| Amir Bazaz | Rui Fragoso | Bingjun Liu | Khadeeja Priyan | P Viswanathan |
| Sanford Berg | Jean Fried | Yanli Liu | Xuning Qiao | Fuqiang Wang |
| Sanjeev Bhuchar | Lonia Friedlander | Dénes Lóczy | Simin Qu | Hongrui Wang |
| Jennifer Biddle | Qiang Fu | Elve Lode | Vivek Rai | Raymond Wang |
| Jorge Bielsa | Ana Galvão | Juan Lopez | Golam Rasul | Jeroen Warner |
| Henning Bjornlund | Marco Gama | Darren Lumbroso | A.Amarender Reddy | Muhammad Watto |
| Fred Bloetscher | Jacques Ganoulis Ph.D. | Yufeng Luo | Tobias Renner | Glenn Watts |
| Kerstin Böck | Dustin Garrick | Sushanta Mahapatra | Luisa Ribeiro | Fany Wedahuditama |
| Eve Brantley | Jeanette Garwood | Dinesh Manhachery | Alistair Rieu-Clarke | Sohan Wijesekera |
| David Brooks | Fana Gebresenbet | Joe Manous | Laura Ruelas-Monjardín | Jannes Willems |
| Adriana Bruggeman | Suzy Goldsmith | Rui Marques | Motahareh Saadatpour | Aaron Wolf |
| Jeff Camkin | Fabio Goncalves | Sara Masia | Susanne Scheierling | Philip Woodhouse |
| Heather Campbell | Francisco González-Gómez | Amaryllis Mavragani | Rodolphe Schlaepfer | Stefanos Xenarios |
| Jianting Cao | Vaibhav Gosavi | David McDonald | Susanne Schmeier | Lianqing Xue |
| Xion Cao | Neil S. Grigg | Jennifer McKay | Klaas Schwartz | Tetsuo Yanagi |
| Bruno Carvalho | Burke Griggs | Yvonilde D. P. Medeiros | K Seetharam | Masoud Yazdanpanah |
| Eustaquio Carvalho | Xinjian Guan | Sander Meijerink | Naser Shabakhti | Aizhong Ye |
| Adrian Cashman | Wilma Guerrero Villegas | Isabela Meline | Hossain Shabanali Fami | Gene, Jiing-Yun You |
| Rita Cavaleiro de Ferreira | Nishikant Gupta | Broder Merkel | Ira Sharkansky | Mike Young |
| Husein Celik | Greg Guthrie | Hojjat Mianabadi | Chen Shen | Muhammad Zaheer |
| Julien Chaisse | Carlos Gutiérrez-Martín | Maria Milanes-Murcia | Francisco Silva Pinto | Slim Zekri |
| M.G. Chandrakanth | Robert Hearne | Kamiar Mohaddes | Pedro Simoes | Feiyun Zhang |
| Bin Chen | R. Hema | Hamid Mohtadi | Nandita Singh | Henry Zhang |
| Dan Chen | Tim Hess | Jose-Luis Molina | MVK Sivamohan | Jin Zhang |
| Wendy Chen | Rosemary Hill | Francois Molle | Ed Smeets | Liangshi Zhao |
| Xi Chen | Jaime Hoogesteger | Saeed Morid | Aditya Sood | Zhongnan Zhao |
| Jonathan Chenoweth | Sissel Hovik | Erik Mostert | Vitor Sousa | Kim Zietlow |
| Srinivas Chokkakula | Guoxiang Huang | Marcelo Motta Veiga | M. Spiliotis | Qiting Zuo |
| Winston Chow | Shaofeng Jia | Pablo José Moya Fernández | Ashlynn Stillwell |