The lack of domestic supply leaves families, especially children, vulnerable to "life-threatening diseases, dangerously low water consumption levels and very poor sanitation standards and hygiene practices, in the home and at school"47 It is estimated that 50 to 55 per cent of Sana'a is connected to public sewage, while the rest relies on individual solutions, which negatively affects the underground water reservoir. “^The combination of dwindling domestic water resources with poor access to sanitation is a catalyst for enteric illnesses that drive malnourishment rates upwards. Importantly, water scarcity affects sub-populations of the city differently, with the most vulnerable being refugees, asylum seekers, IDPs, migrants and, more broadly, poor residents in informal settlements.