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| ජාතික ජලසම්පාදන හා ජලපවහන මණ්ඩලය தேசிய நீர் வழங்கல் வடிகாலமைப்பு சபை | |
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| Agency overview | |
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| Formed | 1975 |
| Preceding agency |
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| Headquarters | Golumadama Junction, Ratmalana, Sri Lanka 6°48′35″N 79°53′00″E / 6.809712°N 79.883354°E |
| Minister responsible |
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| Deputy Minister responsible |
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| Agency executives |
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| Parent department | Ministry of Water Supply and Drainage |
| Child agency |
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| Key document | |
| Website | waterboard |
The National Water Supply and Drainage Board (commonly abbreviated as NWSDB) is the National Organization responsible for the provision of safe drinking water and facilitating the provision of sanitation to the people in Sri Lanka. The organization had its beginning as a subdepartment under the Public Works Department for water supply and drainage. In 1965, it became a division under the Ministry of Local Government. From 1970, this division functioned as a separate department under the Ministry of Irrigation, Power and Highways and remained so until the present board was established in January 1975 by an act of Parliament of Sri Lanka.
The main functions of the National Water Supply & Drainage Board (NWSDB), which presently functions under the Ministry of Water Supply & Drainage, are operation and maintenance of water supply and sewerage schemes, implementation of new urban and rural water supply projects, carrying out sector planning, feasibility studies, detailed designs, tender documentation, contract administration, project supervision, and research and development work in the water and sanitation sector.