Providing sustainable water supply and sanitation (WSS) services in developing countries remains an immense, and increasingly urgent, challenge.

The Millennium Development Goals helped rally the world around the challenge of providing access to improved water supply and sanitation (WSS). By 2015 hundreds of millions of people had gained access to improved water sources and better sanitation. Despite this, with hundreds of millions more still lacking access, much remains to be done.

Results-Based Financing (RBF) refers to a broad family of financial instruments. With RBF, public funding is provided
only if pre-specified results have been achieved. Its use in the sanitation sector has so far been limited, as opposed