Water and wastewater have traditionally constituted TAHAL's core business, with the sector currently accounting for approximately 86% of the Group's operations. TAHAL has been actively involved in the development of water supply systems for domestic, industrial and agricultural use in Asia, Africa, Latin America and Europe, specializing in the rehabilitation of existing systems in order to boost capacity, maximize potential, and increase the area served. Activities in the field also include turnkey projects and concessions involving large transmission mains and major water and wastewater treatment plants. Design of wastewater treatment solutions are in each case determined by effluent disposal alternatives, the aim being, wherever possible, to provide for reuse of effluent in order to prevent environmental problems, while at the same time creating an additional source of water.

Through its subsidiaries TAHAL Consulting Engineers Ltd. and Water Planning for Israel Ltd, TAHAL has since the 1950s been in charge of planning, design and construction supervision of Israel’s national water supply and sewage system, serving as official consultant to the country's Water Commission and National Sewerage Project.

The major part of the Group's services for the water and wastewater sector is handled by TAHAL Consulting Engineers Ltd. (Israel), Palgey Maim (Israel), Milgam (Israel) TASK Water (the Netherlands), TASK Su Kanalizasyon Yatirim Yapim VE Isletim (Turkey), Kardan Water International Group (KWIG) (China), EKO-WARK (Poland) and FIDECO (Serbia).

Services offered:

• Preparation of master plans and feasibility studies for urban and rural water supply systems.

• Detailed design and construction of dams, reservoirs, water treatment plants, pumping stations, desalination plants and water distribution networks.

• Design and construction of wastewater collection, conveyance, treatment and storage systems.

• Design of sludge treatment and treated sludge reuse for generation of energy and other purposes.

• Expansion and rehabilitation planning.

• Tariff studies and financial management.

• Leakage and water conservation studies.

• Institutional strengthening of water and sewage boards.