For financing sanitation in poor urban areas you should have a good look at the essay by Christine Sijbesma, Carlos Diaz, Catarine Fonseca and Christelle Pezon:
Financing sanitation in poor urban areas This essay addresses innovative ways of financing safe sanitation in poor urban households and neighbourhoods. Although sanitation comprises several components, this paper focuses only on human excreta disposal. It is argued that the urban poor already finance their sanitation, mostly in loss of time, energy, dignity, health, income and development opportunities. To turn these losses around and fulfil basic human rights, creative financing systems are needed. Using a combination of literature review, personal and documented experiences, the authors present an overview of traditional and innovative financing approaches and mechanisms for urban poor sanitation, and discuss their advantages and limitations Dowload PDF from https://www.irc.nl/page/45460.
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