Colombo, September 16, 2025 – The National Water Supply and Drainage Board (NWSDB) has announced that a nine-hour water cut will be imposed across Colombo and several adjoining areas on Thursday, September 18, from 10:00 a.m. to 7:00 p.m.
Cause of the Disruption
According to the NWSDB, the interruption in service is due to a power outage at the Ambatale Water Treatment Plant, which supplies a significant portion of water to Colombo and its suburbs.
Areas Affected
The water cut will affect the following areas:
- Colombo 01 to 15
- Battaramulla, Pelawatta, Hokandara, Koswatta, Thalawathugoda, Kotte, Rajagiriya, Mirihana, Madivela, Nugegoda, Nawala, Kolonnawa, IDH, Kotikawatta, Angoda, Wellampitiya, Orugodawatta
- Maharagama, Boralesgamuwa, Dehiwala, Ratmalana, and Moratuwa
Advisory to Residents
Residents in the affected areas are advised to store adequate water in advance and use water sparingly during the scheduled disruption. The Water Board further assured that supply will be restored immediately once maintenance work is completed.
