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Central

Regional Support Center (Central), National Water Supply and Drainage Board

East

Regional Support Center (East), National Water Supply and Drainage Board

North

Regional Support Center (North), National Water Supply and Drainage Board

North Central

Regional Support Center (North Central), National Water Supply and Drainage Board

North Western

Regional Support Center (North Western), National Water Supply and Drainage Board

Sabaragamuwa

Regional Support Center (Sabaragamuwa), National Water Supply and Drainage Board

South

Regional Support Center (South), National Water Supply and Drainage Board

Uva

Regional Support Center (Uva), National Water Supply and Drainage Board

Western - Central

Regional Support Center (Western - Central), National Water Supply and Drainage Board

Western - North

Regional Support Center (Western - North), National Water Supply and Drainage Board

Western - South

Regional Support Center (Western - South), National Water Supply and Drainage Board

Western - Production

Regional Support Center (Western - Production), National Water Supply and Drainage Board