The offer of social housing in South America and in particular in Colombia often does not meet the population real needs. Furthermore the consequences of climate change are affecting this reality, exacerbating even more the instability and insecurity of the informal settlements. For instance, the neighborhooud El Pozón, located in the Colombian city of Cartagena de Indias, in addition to its social and economic problems, is characterized by a contradictory environmental situation. On the one hand it suffers the problem of floods due to its proximity to the Ciénaga de La Virgen and to seasonal heavy rainfall and on the other hand the supply of drinking water is problematic and reaches unsustainable costs for a population who lives in marginal conditions.