This thesis explores the relationship between waterborne diseases and the sources of water and sanitation facilities in flood-affected and river erosion areas of Noakhali, Bangladesh. The study aims to assess how different water sources and sanitation practices influence the prevalence of waterborne diseases in vulnerable communities frequently exposed to floods and riverbank erosion. Data were collected from affected households to analyze patterns of disease occurrence and identify factors contributing to health risks. The findings highlight the urgent need for improved WASH (Water, Sanitation, and Hygiene) interventions and sustainable infrastructure in disaster-prone regions.