The high scientific standards maintained by Journal of Water, Sanitation and Hygiene for Development in its papers owe much to the continuing dedication of the journal's reviewers, who give freely of their time and expertise. IWA 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, Sanitation and Hygiene for Development acknowledge with particular gratitude the following reviewers who have reviewed papers during the period January 2019–December 2019.
| Idris Abdullahi | Derek Chitwood | Tacettin Inandi | Maharjan Namita | Anne Sebert Kuhlmann |
| Ismaila Abubakar | Diane Coffey | S. Irianti | Colleen Naughton | Lucas Seghezzo |
| Yvonne Adjakloe | Jeremy Colin | Mona Iyer | Kate Neely | Swaib Semiyaga |
| Jeff Albert | Jonny Crocker | Mangesh Jagdhane | Pravin Nemade | Tjandra Setiadi |
| Majid Ali | Allison Daniel | Vavaliya Jaladhi | Sintawardani Neni | Aviram Sharma |
| Mohamed Ali | Philip Darko | Kumaran Kalyanraman | Tommy Ngai | Ryan Sinclair |
| Jawad Al-rifai | Daniel Dias | Tussupova Kamshat | Innocent Nhapi | Shirish Singh |
| Richard Amankwah | Leslie Dodson | Edith Kamundi | Punita Nook Naidu | Charlotte Smith |
| Prince Antwi-Agyei | Marta Domini | K.Mophin Kani | Guy Norman | Thomas Soerens |
| Eugene Appiah-Effah | Kathleen Dominique | Md. Rezaul Karim | Kwabena Nyarko | Tiehong Song |
| Sudipti Arora | Caetano Dorea | Mario Kato | Mitsunori Odagiri | Minnepar Sridhar |
| Negin Ashoori | Bloodless Dzwairo | Emma Kelly | Collins Odjadjare | Arulchelvan Sriram |
| Mahad Baawain | Anthony Ewusi | Miles Kirby | Aaron Opdyke | Justin Stoler |
| Claudia Baldwin | Natalie Exum | Pete Kolsky | Rory Padfield | Linda Strande |
| Antonella Bancalari | Peter Feldman | Enoch Kosoe | Vishnu Pandey | David Sutherland |
| Dani Barrington | Lloyd Fisher-Jeffes | Tyhra Kumasi | Siraj Siraj Muhammed Pandhiani | Syed Tauseef |
| Rafael Bastos | Catarina Fonseca | Krishna Lamichhane | Sudan Raj Panthi | Kevin Tayler |
| Nicole Behnke | Tim Foster | Rebecca Lane Evans | Archana Patkar | Imokhai Tenebe |
| David Bethune | Gary Foutch | David Larsen | Catiane Pelissari | Jacqueline Thomas |
| Jane Bevan | Till Francke | Peter Lawrence | José Raúll Pérez Durán | Patrick Thomson |
| Paula Bevilacqua | Colin Fricker | Zifu Li | Andrea Perez-Vidal | James Tidwell |
| Cornelius Bezuidenhout | David Fuente | Harold Lockwood | Megha Phansalkar | Sithabile Tirivarombo |
| Jay Bhagwan | Joe Gadek | Christoph Luthi | Sandhya Rao Poleneni | Adriano Luiz Tonetti |
| Narayaan Billava | Jessen George | Nidal Mahmoud | Kathy Pond | Abdoulaye Toure |
| Gulilat Birhane Eshetu | Redaie Getachew | Nehreen Majed | Sujaya Rathi | Sophie Tremolet |
| Isabel Blackett | Gopal Ghosh | Simon Mariwah | James M Raude | Demetrios Tsesmelis |
| Eline Boelee | Walter Gibson | Luana Mattos de Oliveira Cruz | Peter Ravenscroft | Asad Umar |
| Susan Bolton | Bruce Gordon | Celia McMichael | Brian Reed | Kobus Van Zyl |
| Louis Boorstin | Caitlin Grady | Megat Hanafiah Megat Ahmad Kamal | Shahabaldin Rezania | Ismael Vera |
| Alisson Borges | Amir Hamzeh Haghiadi | Dinesh Mehta | William Reznikoff | Joep Verhagen |
| Robert Bos | Hatem Haidar | Meera Mehta | Alice Richardson | Gladys Vidal |
| Clarissa Brocklehurst | Suzanne Hanchett | Leopoldo Mendoza-Espinosa | Michel Riemersma | Bala Vigneswaran |
| Zachary Burt | Hidenori Harada | Kavitha Menon | U-Primo Rodriguez | Hang Vo |
| Jeff Camkin | James Harper | K.B Mfundisi | Jesús Romalde | Isaac Volschan Jr |
| Kirsty Carden | Shervin Hashemi | Vid Mlakar | Ian Ross | Jeffrey Walters |
| Rachel Cardone | M. Manzurul Hassan | Olubunmi Mokuolu | Michael Rouse | Sian White |
| Bruno Carvalho | Jiajie He | Isaac Monney | Tristano Sainati | Inga Winkler |
| Saroj Chapagain | Yuanqing He | Maggie Montgomery | S Ramesh Sakthivel | Tesfayohanes Yacob |
| Pisit Chareonsudjai | Helvi Heinonen-Tanski | Liberty Moyo | Matthias Saladin | Travis Yates |
| K. Charles | Mitsuaki Hirai | Silver Mugisha | Kasra Samiei | Qian Zhang |
| K.W. Chau | Zvikomborero Hoko | Srikanth Mutnuri | Drissa Sangare | xiaoqin zhou |
| Fu Chen | Rochelle Holm | Zablon Mutongu | Jeta Sankrityayana | Yuezhao Zhu |
| Steven Chiesa | Guy Howard | Dennis Mwanza | Alyse Schrecongost | Florentina Zurita |
| Claudious Chikozho | Isoken Igbinosa | Tanvi Nagpal | Rebecca Scott |