Hello!

There are several free online courses open now on the Cap-Net virtual campus looking at water and sanitaiton service delivery in informal settlements.

One such course focuses on the case of Lima, Peru specifically. It has the particularity of looking at the issues encountered for service delivery from different perspectives - the utility's, as well as that of local organisations and authorities, and residents. It also looks at how corruption or integrity issues might be affecting service delivery.
Sanitation service is a particular challenge and even more 'in the shadows' than water services. Difficult terrain has consequences but so do issues of responsibility, accountability, and corruption.
The course is online through November at this link (in Spanish):
cap-net.org/asentamientos-humanos-lima/

A broader course is also available. It looks at different cases and their impact for integrity, from South Africa, Kenya, and Argentina.
cap-net.org/informal_settlements/