Manager Office Manager Office Manager Kelaniya National Water Supply & Drainage Board, 11, Dippitiyagoda Road, Kelaniya +94 11 2909854 Manager Gampaha National Water Supply & Drainage Board, 36/1 Bauddhaloka Mawatha, Gampaha. +94 33 2236069 +94 33 2231464 +94 33 2232718