Is Tap Water Safe to Drink in Colombo?
No, tap water in Colombo is not safe to drink. The National Water Supply and Drainage Board (NWSDB) operates treatment plants, but the distribution network is old and prone to contamination, particularly during monsoon flooding.
Water Source
Colombo’s water is drawn primarily from the Kelani River at the Ambatale Treatment Plant, the country’s largest, supplemented by the Labugama and Kalatuwawa reservoirs in the hill country.
Contaminants & Concerns
The Kelani River carries industrial effluent from upstream factories and untreated sewage. While the Ambatale plant treats the water, corroded distribution pipes — many dating to the colonial era — reintroduce contaminants. During monsoon floods, pipe breaks and sewage overflow worsen contamination significantly.
Tips
- •Use bottled water from established brands like Elephant House or Aquafina — readily available everywhere
- •Hotels rated four stars and above generally provide safe drinking water through in-house filtration
- •Avoid tap water for brushing teeth in budget accommodation and guesthouses
Frequently Asked Questions
Sources & References
The safety rating and guidance on this page draw on the following sources. See our full methodology.
- •WHO Guidelines for Drinking-water Quality
- •CDC Travelers' Health destination pages
- •The municipal water utility's published quality data