Comparing tariffs for water kiosks in Douala, Cameroon, and Dar es-Salaam, Tanzania, with those of water vendors reveals some distinct differences influenced by local regulations and economic conditions.

In Douala, water kiosks typically charge lower tariffs compared to private water vendors. The government regulates the pricing for kiosks, which are often set up to provide affordable water access to low-income communities. Tariffs for water from kiosks can range from about 50 to 100 CFA francs per liter, depending on the location and the management of the kiosk.

On the other hand, in Dar es-Salaam, the situation is somewhat similar but with variations. Water kiosks are often operated by the city’s water authority or NGOs and offer prices that can be more affordable than those of private vendors. The cost at kiosks can be around 200 to 300 Tanzanian shillings per liter, while private vendors may charge significantly more—sometimes up to 500 to 700 shillings per liter—due to transportation costs and the convenience they provide.

Overall, both cities' water kiosks aim to provide a more affordable alternative to private vendors, although the exact pricing can vary based on local economic factors and infrastructure.

For more detailed and specific figures, local reports from water authorities or NGOs in these regions would provide the most accurate and up-to-date information.