Catholic Relief Services (see their Water and Sanitation page) have just published Rapid Assessment of CRS Experience with Arborloos in East Africa by Paul Hébert. It’s a really interesting account of the large-scale implementation of this terrific rural sanitation technology. Here’s an excerpt from the Executive Summary:
From 2005 to 2009 in Ethiopia, 53,840 households in 7 regions installed Arborloos with the help of CRS and partners. … In Ethiopia, the large number of Arborloos constructed by households from 2005 to 2009 was nearly ten times the number of conventional latrines built between 1995 and 2004, which were found to be more costly and difficult for households to construct. CRS considers this expansion to be a major breakthrough with the potential for significant scale up.
The cost per household? Very little: USD 16 in Ethiopia and USD 19−21 in Kenya, Tanzania and Uganda.