The high scientific standards maintained by Water Supply in their papers owes much to the continuing dedication of the journals' 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 Editor in Chief, Editors and Associate Editors of Water Supply acknowledges with particular gratitude the reviewers who have reviewed papers during the period January 2020–December 2020.
| Roshanida A Rahman | Ivana Ćipranić | Yajie Hu | Fhumulani Mathivha | Ed Smeets |
| Mohammad Mahdi A. Shirazi | Eoghan Clifford | Guanghui Hua | Antonio Matos | Patrick Smeets |
| Mehdi Aalipour Erdi | Ricardo Cobacho | Jinliang Huang | Harri Mattila | Leszek Sobkowiak |
| Nurul Aiin Ab Aziz | Luciano Coccagna | Lizhi Huang | Catalina Maya | Maria Do Carmo Sobral |
| Aminuddin Ab Ghani | Ian Cooper | Pengnian Huang | Larry Mays | Sait Sofuoglu |
| Haq Nawaz Abbasi | Diego Copetti | Po-Jung Huang | Md Azlin Md Said | Jaber Soltani |
| Maher Abboudi | Nadim Copty | Xiao Huang | Shahrzad Mehrabi | J. Song |
| Mohmed Abdalhi | Lucila Coral | Xiaoxing Huang | Darshan Mehta | Hans-Christian Sorge |
| Omar Abdeldayem | Sarah Cornell | Xiaoyuan Huang | Changqing Meng | Joaquim Sousa |
| Maazouzi Abdelhak | Benito Corona Vasquez | Yuk Huang | Gérard Merlin | Debora Souza |
| Kaoru Abe | Juana Cortés Muñoz | Zhenping Huang | Bruno Merz | K Sreelash |
| Amila Abeynayaka | Enrico Creaco | Jixiang Huo | Carsten Meyer | R S Srivastava |
| Akebe Luther King Abia | Jan Cromphout | Stewart Husband | Barbara Milici | Stefan Stanko |
| Ali Abojassim | Brian Crookston | Faten Hussein | Joong-Hyuk Min | Anna Strataridakis |
| Enas Aboutaleb | Marco Antonio Cruz Chavez | Kao Shu Hwang | Gholamreza Mirzavand | Huaizhi Su |
| Olusegun Adeoti | Abdelkrim Dahmen | Saber Imanzadeh | Steve Mitchell | Ming Su |
| Arash Adib | Glen Daigger | Maria Ines Zanolli Sato | M Mitrakas | Sobana Subramani |
| Muhammad Irfan Ahamad | J Dalton | Will Ingram | Li Mo | Chaisri Suksaroj |
| Mansoor Ahammed | Rasoul Daneshfaraz | Takanobu Inoue | Yan Mo | Jian Sun |
| Muhammad Abbas Ahmad Zaini | D. Daniel | Unai Iriarte | Michael Möderl | S Sun |
| Arman Ahmadi | Jew Das | Ayumi Ito | Abu Bakar Mohamad | Wenjun Sun |
| Jane Aiken | Giovanni De Feo | Damjan Ivetic | S Mohan | Yanzan Sun |
| Seval Akal Solmaz | Mauro De Marchis | Mahsa Jahandideh-Tehrani | S Mohanasundaram | Marimuthu Sundaravadivel |
| Chalang Akram Omar Arslan | Nilo de Oliveira Nascimento | Sanghyun Jeong | Rojacques Mompremier | Maciej Szwast |
| Hakan Aksu | Mahmoud Debabeche | Vincent Ji | Hamid Momtazpour | Ruhhee Tabbussum |
| Wazir Alam | Amir Dehghani | Yi Ji | Paul Monis | Hideyuki Tadokoro |
| Eleftheria Alexandri | Xitlali Delgado-Galván | Rui-bao Jia | Laura Monteiro | Satoshi Takizawa |
| Katherine Alfredo | Ianis Delpla | Jia-Qian Jiang | Mauricio Morel | Ashish Tambi |
| Hussein Alghazali | Abel Dembélé | Fernando Jiménez-Barredo | Marco Antonio Moreno Leon | Qiaofeng Tan |
| Mahmoud Al-Hindi | Guangyao Deng | Xiaohui Jin | Maruf Mortula | Roman Tandich |
| Farhad Alizadeh | Jing-yun Deng | Hefang Jing | Ann Mounteer | Li-mo Tang |
| Isabel Almeida | Shihai Deng | Shuh-Ren Jing | Georgios Mousmoulis | Tiku Tanyimboh |
| Paola Almeida-Guerra | Wu Deng | Olof Jonasson | enlin Mu | Bassam Tawabini |
| Abbas Al-Omari | Dhammika DeSilva | Ron Jong | Ayse Muhammetoglu | Alemtsehay Tesfay Reda |
| Mena Alsawaf | Ricardo Deus | Sahand Jorfi | Charongpun Musikavong | Jen Tien-Chien |
| Hussain Al-Towaie | Ricard Devesa Garriga | V. Jothiprakash | Syed Muztuza Ali | Zahia Tigrine |
| Hector Alvarez | Cristiana Di Cristo | Miodrag Jovanovic | N Naidoo | S Tirivarombo |
| Stefano Alvisi | Vittorio Di Federico | Talis Juhna | Meriem Naimi Ait-Aoudia | Mukesh Tiwari |
| Kamel K. Al-Zboon | Santino Diberardino | Tim Julian | Mohammad Najafzadeh | Radoslav Tonev |
| Tony Amato | Heiko Diestel | Byung-Moon Jun | Laith Najam | Kiran Tota-Maharaj |
| Martin Anda | Jörg Dietrich | Jose Luis Jurado Baizaval | Mohsen Najarchi | Carla Tricarico |
| Anastasia Angelaki | Mehmet Dilekoglu | Davie Kadyampakeni | Kazunori Nakano | E. Tsagkari |
| Andreas Angelakis | Ziyu Ding | Farhoud Kalateh | Umamahesh Nanduri | Stavroula Tsitsifli |
| Y. Arai | Mehdi Dini | Herbert Kalibbala | Natarajan Narayanan | Hsin-hsin Tung |
| George Arampatzis | Berge Djebedjian | Norashikin Kamal | Ahmed Kabashi Nassereldeen | Antal Tungler |
| Matthew Arduino | Dejana Djordjevic | Takashi Kameya | Mehdi Nemati | Mustafa Turan |
| Leonardo Arias-Rodriguez | Slaven Dobrovic | Riitta Kamula | Romeu Neto | Vasilios Tzanakakis |
| Yalcin Arisoy | Angelo Doglioni | Vasilis Kanakoudis | Tze Ling Ng | Camelia Ucenic |
| D Arunajanani | Caetano Dorea | Hyo Kang | Thi Phuong Nga Nguyen | Bogumil Ulanicki |
| R Arunkumar | Ming Dou | Mengjun Kang | Chris Nokes | Taro Urase |
| Gholamreza Asadollahfardi | Walter Dragoni | Ethem Karadirek | D Normala Halimoon | Lokman Uzun |
| Adil Ashraf | Xinqiang Du | Theodoros Karakasidis | Vahid Nourani | Mohammad Vaghefi |
| Nadia Ayub | Alex Duan | George Karatzas | Gertrud Nürnberg | Babak Vaheddoost |
| Hazi Azamathulla | Huan-Feng Duan | Bryan Karney | Passwell Nyahora | S Vaibhav |
| Ali Azarnivand | Hung Duong | Konstantinos Katsifarakis | Yumiko Ohkouchi | Elisabete Valerio |
| Isaac Azuz-Adeath | Bruce Dvorak | S. Kavitha | Dagoberto Okada | Viola Vambol |
| Arno Baeumer | Zbyslaw Dymaczewski | Mona Kejariwal | Silvia Oliveira | Martin van der Schans |
| Abdolreza Bahremand | Mawuli Dzakpasu | E. Keramaris | Geoff O'Loughlin | Jakobus van Zyl |
| Dan Bai | Mauricio Dziedzic | Alireza Keramat | Philip Orr | Marta Vargha |
| Xiaohui Bai | Shinya Echigo | Peter Kern | Avi Ostfeld | Lampros Vasileiadis |
| Aminuddin Baki | Thomas Egli | Nahed Khairy Ismael | Noraisha Oyama | Cameron Veal |
| Patricia Bakir | Mohammad Reza Eini | Rajnikant Khatsuria | Kannan Pakshirajan | Vamsi Krishna Vema |
| Gabriella Balacco | Karim Eini Kandi | Kyoungrean Kim | Sema Pala | Giacomo Viccione |
| S P Balasubramani | Nizam El-Ashgar | Lee-Hyung Kim | Michele Palermo | Julia Vierheilig |
| Sengottuvelan Balasubramanian | Ahmed Elshafie | Sangdan Kim | Giuseppina Palma | C. Visvanathan |
| James Ball | Mohamed Eltarabily | Ivana Klun | Bin Pan | Ding Wang |
| Wasala Banara | Fabrizio Erbetta | Heloise Knapik | Andreas Panagopoulos | Gen-Shuh Wang |
| Kailas Banerjee | Ruggero Ermini | Kenichiro Kobayashi | Manish Pandey | Hao Wang |
| Bijit Banik | Burcu Ertit Taştan | Niranjan Koirala | Miguel Pardo Picazo | Hongrui Wang |
| Reza Barati | Saeid Eslamian | Santanu Koley | Abbas Parsaie | Huijie Wang |
| Benoit Barbeau | Vicent Espert | Yanlong Kong | Srinivas Pasupuleti | Juan Wang |
| Emanuele Barca | Enelton Fagnani | Akechai Kongprajug | Sachin Patil | Junjie Wang |
| Brian Barkdoll | Roger Falconer | Roger König | Roberta Pellegrino | Kun Wang |
| S. Barnard | Cairui Fan | Plakas Konstantinos | Genevieve Pelletier | Lin Wang |
| Michael Barrett | Fernando Fan | Tomas Kozel | Xiujian Peng | Luxin Wang |
| Norazlina Bateni | Jiajia Fan | M. Kragulj | Y. Peng | Shengfu Wang |
| John Bavor | Shibiao Fang | Ashok Kumar | Silvano Pereira | Xianghui Wang |
| Shishir Kumar Behera | Franz Fardin | Bijendra Kumar | Andrea Perez | Xiaoxiang Wang |
| Miray Bekbölet | Nadia Farhat | Bimlesh Kumar | Fidel Perez | Xie-Kang Wang |
| Randha Bellatreche Ouali | Elizabeth Fassman-Beck | R. Naresh Kumar | Modesto Perez-Sanchez | Xihua Wang |
| L Ben Ayed | Yuxi Feng | Ramesh Kumar | Jorge Pesantez | Xiuzhi Wang |
| T. Bergel | David Ferras | Ravinder Kumar | Dana Petcu | Yan Wang |
| Taoufik Bettaieb | Joao Ferreira | Surendra Kumar | Giuseppe Pezzinga | Ying Wang |
| Pankaj Bhatt | Sidney Ferreira Filho | Vikram Kumar | Athit Phetrak | Yong Wang |
| Haq Bhatti | Attilio Fiorini Morosini | Sangeeta Kumari | Brett Phillips | Yuankun Wang |
| Subhamoy Bhowmick | Lloyd Fisher-Jeffes | Taketoshi Kusakabe | Stefania Piazza | Zhiwei Wang |
| Yanhong Bian | Juergen Foerster | Goffredo La Loggia | Katarzyna Pietrucha-Urbanik | Muhammad Waqar |
| Prashant Birbal | Kristian Förster | Mitchell Laginestra | J. Pinho | Bowen Wei |
| David Blackwood | Vassilis Fotopoulos | Chin-Hsing Lai | Patrizia Piro | Jannis Wenk |
| Tobias Bleninger | Marcus Fowler | Abderrahim Lakhouit | Marie-Noëlle Pons | John West |
| David Blersch | Biao Frank | Sawanya Laohaprapanon | Ludovico Pontoni | Sally Weston |
| Jessica Bohorquez | Hannah Franklin | Daniele Laucelli | Natasha Potgieter | J Willet |
| Sara Bonetta | Torsten Franz | Markus Lechner | Masoud Pourgholam-Amiji | Alan Wilson |
| Tatiana Borisova | Gabriele Freni | MarÃa Ledesma | Tista Prasai Joshi | Kevin Winter |
| Péter Borsányi | Qiang Fu | Charles Lee | Caitlin Proctor | Christian Wolf |
| Silvena Boteva | Xuhui Fu | Hye-Jin Lee | Dusan Prodanovic | Małgorzata Wolska |
| Noureddine Bouaicha | Lothar Fuchs | Jun Lee | Jaan Pu | Feng Wu |
| Hulya Boyacioglu | Maria Fuerhacker | Pedro Lee | Alessio Pugliese | Jianyong Wu |
| Cristiana Bragalli | Manabu Fujii | Tsu-chuan Lee | Francesco Pugliese | Yuanqing Wu |
| Kevin Bral | Kit Fai Fung | Yves Legat | Valeria Puleo | Jihong Xia |
| Nemanja Branisavljevic | Hiroaki Furumai | Midred Lemus-Perez | Limin Qi | Qing Xiao |
| Lena Breitenmoser | Hamza Gabriel | Lee Leon | Shangtuo Qian | Xian Xie |
| Dejan Brkić | Hadi Galavi | Angelo Leopardi | Yin Qian | Jiale Xu |
| John Hagan Brown | Panagiota Galiatsatou | Michalis Leotsinidis | Hui Qin | Qiang Xu |
| Brian Brownlee | Carlos Galvão | Andrija Lesar | John Radcliffe | Surong Xu |
| Harry Bruning | Amir Gandomi | Daphne Lewarne | Athanasios Ragkos | Kaixi Xue |
| Bruno Brunone | Jinliang Gao | Chaochao Li | Matin Rahnamay Naeini | Anamika Yadav |
| Steven Buchberger | Yulan Gao | Da-ming Li | Leon Raj | Toshiro Yamada |
| Rodrigo Bueno | Zhiwei Gao | Daxue Li | Venkata Siva Rama Prasad | Jingxin Yang |
| Ha Bui Manh | Lucas Garcia | Dong-qing Li | Guangren Ran | Min Yang |
| Gary Burlingame | Rudy Gargano | Heng Li | Msd Rana | Shan-hua Yang |
| Jedrzej Bylka | Fabio Garzon | Jidong Li | Qinghua Rao | YC Ethan Yang |
| Sivapragasam C | Govert Geldof | Jing Li | Mohammad Rashki | Yulong Yang |
| Jaime Cabral | Andrei Georgescu | Juan Li | Tabasum Rasool | Zhongping Yang |
| Enrique Cabrera Marcet | Sanda-Carmen Georgescu | Kevin Li | Nasir Rather | Stavros Yannopoulos |
| L.-Y. Cai | Pantazis Georgiou | Ran LI | Upaka Rathnayake | Abdolreza Yazdani-Chamzini |
| Cesar Calderon Molgora | Amir Ghaderi | Si Li | Andrea Rechenburg | Jian Ye |
| Şule Camcıoğlu | Roghayeh Ghasempour | Simeng Li | Luisa Reis | Lei Ye |
| Alberto Campisano | Pouya Ghezelayagh | Zhijia Li | Anacleto Rizzo | Hsuan-Hsien Yeh |
| Marcus André Campos | Anish Ghimire | Ziyan Li | Paolo Roccaro | Nese Yilmaz |
| Tao Cao | Spyros Giakoumakis | Warunsak Liamlaem | Luis Rodríguez-Gómez | Wei Yin |
| Xiufeng Cao | Thomas Gillogly | Roland Liemberger | Raquel Sabogal | G Yu |
| Andrea Capodaglio | Balendu Giri | Fang Yee Lim | Lyda Patricia Sabogal-Paz | Jianwei Yu |
| Caterina Capponi | Corrado Gisonni | Fuhong Lin | Domenico Saccone | Tingchao Yu |
| Irene Carra | Mauro Giudici | Po-Hsun Lin | Mehrnaz Sadr | Chengfu Yuan |
| Adrian Cashman | Sudha Goel | Tsair-Fuh Lin | Iraj Saeedpanah | Süleyman Yüce |
| Luis Castillo | Abdelaziz Gohar | Zhulu Lin | Messaoud Saidani | Qiang Yue |
| Ferhan Çeçen | Jorge Gomez-Marin | Bojun Liu | Ali Salem | Chunfang Yue |
| Alciviadis-Constantinos Cefalas | Modreck Gomo | Haisheng Liu | Miquel Salgot | Willem Jan Zaadnoordijk |
| Ahmet Celebi | José Gonçalves | Hongbo Liu | Elad Salomons | Zaki Zainudin |
| Barbara Čenčur Curk | Rebeca González-Villela | J.C. Liu | Ricardo Santos | Sarvin Zamanzad-Ghavidel |
| Jafar Chabokpour | Marjan Goodarzi | Jingsen Liu | Hisashi Satoh | Masoumeh Zeinali |
| B. R. Chahar | Brij Gopal | Qunli Liu | Dragan Savic | Masoumeh Zeinalie |
| Junrui Chai | Natanamurugaraj Govindan | Tongyu Liu | Ljubodrag Savic | Yelong Zeng |
| Liyuan Chai | Willie Grabow | Wen-Cheng Liu | Svetislav Savović | Chao Zhang |
| Xiaoli Chai | Maria Gratziou | Zhaowei Liu | Gary Schafran | Congguang Zhang |
| Sudip Chakraborty | John Greenman | Zhiquan Liu | Andreas Schmid | Dawei Zhang |
| Arunima Chanda | Fang Guo | Lorena Liuzzo | Jens Schönfeld | Fan Zhang |
| S. Chandran | Wenxian Guo | Bandunee Liyanage | Ute Schwotzer | Haihan Zhang |
| David Chang | Xinlei Guo | Joan Llorens | Mohammad Taghi Serajian | Jianmin Zhang |
| Shu-Chi Chang | Rajesh Gupta | S L Lo | Tjandra Setiadi | Jingwen Zhang |
| Barkha Chaplot | Anup Gurung | Jenyuk Lohwacharin | Omid Seyedashraf | Lilan Zhang |
| Malay Chaudhuri | Thulo Gurung | Paola Lombardo | Muhamamd Shahid | Xiang Zhang |
| Christian Chauret | Akira Hafuka | Sandro Longo | Isam Shahrour | Xiangru Zhang |
| Puneet Pal Cheema | Dongshen Han | Moez Louati | Lianhai Shan | Yizhang Zhang |
| Baiyang Chen | Shumin Han | A. Loukas | Peter Shanahan | Yuchao Zhang |
| Bin Chen | Xue Han | Xianxin Luo | Yingnan Shang | Yuzhi Zhang |
| Chiaying Chen | Sam Hancock | Edevar Luvisotto Junior | Sicheng Shao | Zheng Zhang |
| Guowei Chen | Hidenori Harada | Fei Ma | Himanshu Sharma | Bin Zhao |
| He Chen | Hongming He | Maritza Macias-Corral | Om Prakash Sharma | Tao Zheng |
| He Chen | Jiajie He | Mohamad Reza Madadi | Pramod Sharma | Zhang Zhiming |
| Jui-Sheng Chen | Pengfei Hei | Olfa Mahjoub | Jichuan Sheng | Qiang Zhong |
| Libin Chen | María Hellmers | Anurag Malik | Weiyu Shi | Fei Zhou |
| Ting-Chien Chen | Mehrdad Hesampour | Stefano Mambretti | Ming-Cheng Shih | Xiaolu Zhou |
| Wei-Hsiang Choi | Stephan Hilgert | Pedro Manso | Gyan Shrivastava | Yaoyu Zhou |
| Florence Choo | Gudrun Hillebrand | Haitao Mao | Shihu Shu | Zhenmin Zhou |
| Oussama Choura | Chia-Chun Ho | Johannes Maree | Praveen Sihag | Zhenming Zhou |
| Chris Chow | Tsung Chun Ho | Rui Marques | Helena Simão | Dejun Zhu |
| Cristiano Christofaro | Birgitte Hoffmann | Valentina Marsili | Dai Simazaki | Xingye Zhu |
| Constantinos Chrysikopoulos | Thomas Holm | Alejandra Martín Domínguez | Antonietta Simone | Yonghua Zhu |
| Hawn-Chung Chu | Li Hongyi | Fernando Martins | Gurmeet Singh | Budo Zindovic |
| Wenhai Chu | Marjan Hosseini | Nuno Martins | Saikat Sinha Ray | Xiaobo Zou |
| Yi-Hsueh Chuang | Seyed-Mohammad Hosseini-Moghari | Daniel Marton | Eyüp Şişman | Anastasios Zouboulis |
| Francesco Gino Ciliberti | Guy Howard | Costantino Masciopinto | Glynn Skerratt | Fang Zuo |
| Luigi Cimorelli | V. Hrissanthou | Josep Mas-Pla | Zekri Slim | Alyaa Zyara |