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Brian Reed
Freelance WASH trainer

Have a look at 

ABBOTT, J., LEGESSE, N.B., BASTABLE, A., EARL, E., GREEN, R., HENNAYAKE, M., ILLMAN, S., JENKINSON, R., REED, B.J., RUIZ-APILANEZ, I., SHAFFER, P., SVIDRAN, R., and SMITH, D., 2019. Surface Water Management in Humanitarian Contexts [online]. London, UK. Available from:

But BCS is a nightmare! If you have found good advice, share it!


New systematic review and meta-analysis on effectiveness of WASH interventions

Researchers at the Emory Rollins School of Public Health, in collaboration with the WHO, UNICEF, and others recently published (July, 2022) a systematic review and meta-analysis on effectiveness of WASH interventions.

This meta-analysis provided up-to-date estimates on the burden of diseases attributed to WASH. The two previous systematic reviews were published in 2014 and 2018. This new systematic-review included 124 studies (83 observations for water, 20 for sanitation and 41 for hygiene).

The main quantitative findings are summarized below:
When compared with unimproved water source, the reduction in risk of diarrhoea were:

  • 52% for improved drinking water on premises with higher water quality
  • 50% for water filtered at Point-of-Use (POU)
  • 21% for basic sanitation without sewer connection
  • 47% for basic sanitation with sewer connection
  • 30% for hygiene interventions.

Sex-disaggregated data is very limited in WASH context, only 4% of the included studies. (In my opinion, this is a huge data gap).

Highlights, impressions and suggestions from this meta-analysis:

  1. Drinking water of higher quality and water filtered at POU are effective (up to around 50%) in reducing diarrheal risk.
  2. Basic sanitation services without sewer connection were associated with a moderate reduction in risk of diarrhoea.
  3. Sewered sanitation has a greater effect on health than on-site sanitation. (there are several explanations for this suggestion)
  4. The risk reduction of diarrhoeal disease from handwashing interventions is impressive.

It is an open access paper.

What do you think about their findings? Surprising?

Journal reference:

Wolf, J., et al. (2022) Effectiveness of interventions to improve... (More)

Brian Reed
Freelance WASH trainer

WASh'Em Webinar

Dear colleague,

The final Wash’Em Champion’s webinar, Wash’Em implementation experiences, is happening tomorrow on Tuesday, June 28. Spots are filling up quickly so make sure to secure your seat today, register now.

In Wash’Em implementation experiences, you’ll hear from multiple organizations about how they’ve implemented Wash’Em in regions around the world, and learn how you can effectively use Wash’Em in your region. |

Looking forward to seeing you tomorrow!

The Wash’Em Team

Cher collègue,

Le webinaire final des Champions Wash’Em, Expériences de mise en œuvre de Wash'Em, se déroulera le mardi 28 juin. 

Cette série de webinaires passionnants arrivant à sa conclusion, la liste des participants se remplit rapidement. Inscrivez-vous dès maintenant.

Au cours du webinaire Expériences de mise en œuvre de Wash'Em, plusieurs organisations témoigneront de leurs expériences de mise en œuvre de Wash’Em dans différentes régions du monde, et vous apprendrez comment utiliser efficacement Wash’Em dans votre région.

Au plaisir de vous voir au prochain webinaire !

L'équipe Wash’Em

Estimado colega,

El último seminario web de Impulsores de Wash'Em, Experiencias de implementación de Wash’Em, se llevará a cabo el martes 28 de junio.

La lista de participantes crece cada vez más a medida que se acerca la última fecha de esta extraordinaria serie de seminarios web. Inscríbase ahora.

En Experiencias de implementación de Wash’Em, varias organizaciones compartirán sus experiencias en la implementación de Wash'Em en diferentes regiones del mundo.

¡Esperamos verle en el próximo seminario web!

El equipo de Wash’Em