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 2018–December 2018.
| Pamela Abbott | Didia Covas | Guoxiang Huang | Hamid Mohtadi | Danka Thalmeinerova |
| Ismael Aguilar-Barajas | Lin Crase | Kai Huang | Maria Molinos Senante | Thomas Tsalis |
| Angelos Alamanos | Tomas Cuesta | Qiuqiong Huang | Marco Montenegro | Mireia Tutusaus Luque |
| Jose Albiac | Bruce Currie-Alder | Soonjin Hwang | Saeed Morid | Vasilios Tzanakakis |
| Lee Allen | Bowman Cutter | Helen Ingram | Marcelo Motta Veiga | Olcay Unver |
| Maria do Céu S. T. Almeida | Xiaoping Dai | Kenneth Irvine | Arthur Mynett | Norman Uphoff |
| Kamal Alsharif | Keshab Das | Olivia Jensen | Daniel Narzetti | Elena Vallino |
| Dogan Altinbilek | Matthew Deitch | Wendy Jepson | Susana Neto | Caroline van den Berg |
| Upali Amarasinghe | Joe Dellapena | Fengrui Jia | Rodrigo Oliveira | Tom van der Voorn |
| Sarah Anderson | Jerome Delli Priscoli | Shaofeng Jia | Afua Owusu | Pieter Van der Zaag |
| A. N. Angelakis | KV Dinesh | MinFei Jian | Mariya Pak | Gerardo van Halsema |
| Erik Ansink | Meredith Dobbie | Alejandro Jiménez | Maria Pascual Sanz | James VanDerslice |
| Ann Arnold | Brian Dollery | Juliang Jin | Tao Peng | Laura Vargas |
| Jose Luis Arumi | Renata Dondajewska | Stephen Jones | Agustí Pérez-Foguet | Emmanouil Varouchakis |
| Vandana Asthana | Leihua Dong | Shannon Joseph | Kenneth M. Persson | Athanasios Vavatsikos |
| Sedat Ayanoglu | Zengchuan Dong | Jonghun Kam | Mary Pitts | Niranjan Vedantam |
| Roger W. Bachmann | Gabriele Dono | Vasilis Kanakoudis | Ioana Popescu | L. Venkatachalam |
| Chandra Bahinipati | Guillermo Donoso | Tapio Katko | Simon Porcher | Joshua Viers |
| Claudia Baldwin | Ben Dziegielewski | David Katz | Sarah Praskievicz | Ratna Reddy Vippala |
| Elizabeth Baldwin | Mark Elliott | Nerantzis Kazakis | Khadeeja Priyan | Konstantinos Voudouris |
| Gábor Baranyai | Kwame Emmanuel | Andrea Keessen | Bill Puckett | Nikolaos Voulvoulis |
| Bernard Barraque | Joanna Endter-Wada | Jerson Kelman | Xuning Qiao | Fuqiang Wang |
| Anamika Barua | Bert Enserink | Vimal Khawas | Simin Qu | Guoxiang Wang |
| Nitin Bassi | Josep Espugla | Anthony Kiem | Pranay Ranjan | Hongrui Wang |
| Carl J. Bauer | Francesco Fatone | Demetris Koutsoyiannis | Golam Rasul | Huimin Wang |
| Amir Bazaz | Jean-Marc Faures | Debolina Kundu | Niels Riegels | Zhaoli Wang |
| Basundhara Bhattarai | Eran Feitelson | Chengguang Lai | Giulia Romano | Ashley Webb |
| Sanjeev Bhuchar | Zoltán Ferencz | Henrik Larsen | Laura Ruelas-Monjardín | Sohan Wijesekera |
| Jorge Bielsa | Diogo Ferreira | Jin-Yong Lee | Meera Sahasranaman | Maxwell Wilson |
| Krzysztof Boryczko | Jose Figueira | Ti Le-Huu | Klaas Schwartz | Kevin Winter |
| Nolwenn Bougon | Jean Fried | Fadong Li | Christopher Scott | Aaron Wolf |
| Jonathan Broadbent | Qiang Fu | Lan Hai Li | K Seetharam | Yuan Xia |
| Nathaniel Broadhurst | Qianzhao Gao | Mingliang Li | Jenniver Sehring | Yang Xu |
| Tim Burt | Shizhao Gao | Peiyue Li | Sudeshna Sen | Huifeng Xue |
| Mokhtar Bzioui | Sanchari Ghosh | Bingjun Liu | Ana Serrano González | Yan Yan |
| Mingyong Cai | Fabio Goncalves | Yanli Liu | Naser Shabakhti | Zhang Yan |
| Ximing Cai | Govind Gopakumar | Maria Llop | Aviram Sharma | Tetsuo Yanagi |
| Günay Çakir | R. Quentin Grafton | Aihua Long | Chen Shen | Qingchun Yang |
| Javier Calatrava | Colin Green | Juan Lopez | Jichuan Sheng | Yu Yang |
| Jianting Cao | Neil S. Grigg | Qiong Lu | Francisco Silva Pinto | Farhard Yasdonoost |
| Xion Cao | Wen Gu | Jampani Mahesh | Hugo Silvestre | Aizhong Ye |
| Yongqiang Cao | Zhenghua Gu | R P S Malik | Pedro Simoes | Yin Yin |
| Kirsty Carden | Xinjian Guan | Alberta Mandich | Chandni Singh | Jinjun You |
| Daniela Carrijo | Javier Guerrero | Dinesh Manhachery | Vishal Singh | Gene, Jiing-Yun You |
| Eustaquio Carvalho | Greg Guthrie | Joe Manous | MVK Sivamohan | Mike Young |
| Adrian Cashman | Alvaro Gutiérrez-Malaxechebarría | Rui Marques | Ed Smeets | Jin Yu |
| Rita Cavaleiro de Ferreira | Dipak Gyawali | Amaryllis Mavragani | Daniel Smith | Xiubo Yu |
| Julien Chaisse | Efrat Hadas | Ruth Meinzen-Dick | Mark Smith | Chuanqing Zhang |
| M.G. Chandrakanth | Cameron Handyside | Isabela Meline | Ľubomír Solín | Jin Zhang |
| Bin Chen | Leila Harris | Guillermo Mendoza | Puneet Srivastava | Junyi Zhang |
| Dan Chen | Robert Hearne | Doug Merrey | Eugene Stakhiv | Liangshi Zhao |
| Xuesong Cheng | Tanya Heikkila | James Metcalf | Diana Suhardiman | Tony Zhao |
| Srinivas Chokkakula | R. Hema | Hojjat Mianabadi | Caizhi Sun | Guocheng Zhu |
| Nasima Chowdhury | Manuel Herrera | Maria Milanes-Murcia | Wenjun Sun | Qiting Zuo |
| Zoran Ciric | Kong Shan Ho | Thomas Miller | Sunil Tankha | |
| Marius Claassen | Bruce Hooper | Kamiar Mohaddes | Pierre Teniere Bouchet |