Access to clean water and sanitation is crucial for health. A study in Nairobi's slums looked at factors influencing transitions in water and sanitation services. Results showed that factors like location, wealth, age, and ownership affect these transitions. Households take longer to move from unimproved to improved sanitation services compared to water and garbage services. Sanitation services in Nairobi's slums are still inadequate, and efforts are needed to ensure sustained improvements for better health outcomes.