Can You Drink Tap Water in Comoros?

Tap water in Comoros is not safe to drink for visitors. The Comoros archipelago — comprising Grande Comore, Anjouan, and Mohéli — has limited freshwater resources and severely underdeveloped water infrastructure. The islands rely on a combination of groundwater, rainwater collection, and limited treatment systems that cannot reliably produce safe drinking water for all residents, let alone visitors.

Moroni, the capital on Grande Comore, is the most visited city and main entry point to the archipelago. The city has a partial piped water supply but it is not reliably treated and quality varies significantly by area. Hotels and guesthouses in Moroni provide bottled water for guests. Bottled water is available in shops and markets in the capital.

Grande Comore's most dramatic feature is Mount Karthala, one of the world's largest active volcanoes and a popular hiking destination. The ascent to the caldera takes hikers through forest and lava fields. Water is not available on the mountain — carry everything from Moroni. Volcanic activity can also affect groundwater quality in some areas of the island.

Anjouan, the second most populated island, has more rainfall than Grande Comore but similarly limited treatment infrastructure. Mohéli, the smallest and least developed island, is increasingly visited for its marine national park and whale watching. Water infrastructure on Mohéli is minimal — bottled water availability is limited and a filter is essential for extended stays.

Use sealed bottled water throughout Comoros for drinking and brushing teeth. Carry a portable filter for any hiking, rural travel, or extended stays on the outer islands. The Comoros experiences periodic cholera outbreaks and waterborne disease is a significant public health concern throughout the archipelago.