Nearly 900 million city dwellers worldwide live in informal settlements, and the vast majority lack access to safe water or sanitation.
But with your help, we can ensure better access to these basic services.
Make an online gift now to enable us to improve water and sanitation in urban areas in sub-Saharan Africa and South Asia.
All donations will be made to the WSUP Charity, a UK registered charity (number 1170651) which supports WSUP.
It's really hard to get water and sanitation to the people - all the people - who need it most: we like the systematic way that WSUP brings together all of the key actors in a complicated landscape to drive lasting solutions that focus first on the poor.