Access Engineering Ltd. Ananda Miners Pvt. Ltd. Bogala Graphite Lanka PLC Central Engineering Consultancy Bureau (CECB) Centre for Urban Water, Ministry of Megapolis and Western Development Ceylon Petroleum Storage Terminals CML Edwards Pvt. Ltd. Department of Coastal Conservation Department of Irrigation Disaster Management Centre(DMC) Engineering and Laboratory Services Pvt Ltd (ELS) Foundation and Waterwell Engineering Pvt Ltd Geo Informatics Centre - Thailand Geological Surveying and Mines Bureau (GSMB) Geological Surveying and Mines Bureau- Technical Services (GSMB-TS) Geotech Pvt. Ltd. Greater Colombo Waste Water Mgt. Project Hayles Energy Pvt. Ltd. Hyhundai Engineering Construction Pvt Ltd Illuka Resources Pvt. Ltd. -Australia International Construction Consortium Ltd (ICC) Irata Holding Pvt. Ltd., Mawanella Kahatagaha and Kolonnagaha Mines Ltd Keangnam Enterprises Ltd. Lanka Hydraulic Institute Limited – Coast and Water Lanka Mineral Sands Limited Lanka Phosphate Ltd. Maga Engineering Pvt Ltd. Mahaweli Authority of Sri Lanka Master Divers Pvt. Ltd. Metal Mix Pvt. Ltd. Mine Map Pvt Ltd National Aquatic Resources Development Agency National Building Research Organization (NBRO) National Gem & Juwellaery Authority National Water Supply and Drainage Board- Ratmalana Nawaloka Costruction Pvt Ltd. Petroleum Resources Development Secretariat (PRDS) Ports Authority ROCEL Pvt. Ltd. Sanken Construction Pvt. Ltd. Senarath Group of Companies Senok Quarries Pvt Ltd Siam City Cement [Lanka] Ltd. Sierra Piling Soil Tech Ltd Sri Lanka Ports Authority(SLPA) State Development and Construction Corporation (SD & CC) Sustainable Energy Authority Urban Development Authority (UDA)
