01
About the Utility
Oman Water and Wastewater Services Company, trading as Nama Water Services, is a closed joint-stock company and a subsidiary of Electricity Holding Company (Nama Group), owned via Nama Holding by the Oman Investment Authority. Founded in 2003 as a wastewater company, it later extended that mandate across the Sultanate and absorbed the assets and responsibilities of the former Public Authority for Water. Royal Decree 40/2023 made it the sole water and wastewater provider nationwide except Dhofar, licensed by the Authority for Public Services Regulation. In July 2026 the Oman Observer reported that the company had awarded a 15-year performance-based contract to a Suez-led consortium to run water and wastewater operations in Muscat and North and South Al Sharqiyah, with Nama Water Services retaining oversight.
02
Water System
Nama Water Services produced 428.6 million cubic metres of potable water in 2025, slightly less than in 2024. The defining operating constraint is the gap between water produced and water delivered to customers. Losses fell steadily to 37.10% in 2024 but remained above that year’s target, and the 2025 annual report records a further 4% reduction. Service reliability has improved alongside: continuity of supply moved from just below target to above it, compliance with Omani drinking-water standards consistently exceeds its target, and the volume of water delivered to customers rose in each year for which it is reported.
Water losses
Potable water losses as a share of production, %, 2021–2024 (calendar years)
Reported actuals. The 2024 target was 35.00%.
Sources: Nama Water Services Annual Reports 2022 (Arabic edition), 2023 and 2024.03
Wastewater System
Wastewater is the company’s founding business and remains a core responsibility. Inflows to treatment facilities were 95.21 million cubic metres in 2025, slightly below the previous year, while the share of treated wastewater put to use rose to 53%. The company describes all of its treatment plants as using membrane bioreactor technology, and it supplies treated effluent for irrigation, planting and construction. The customer base is widening: wastewater accounts grew by 8.8% in 2023, against 3% for water accounts.
04
Investment & Priorities
Price control, applied from 2024, reset the company’s finances. Revenue entitlement now follows a Maximum Allowed Revenue formula covering operating costs, depreciation and a return on the Regulated Asset Base, with any shortfall becoming a subsidy entitlement, so 2024 operating revenue included a substantial government subsidy. The company also completed a debt restructuring that year. Capital activity is visible through procurement: tenders active in May 2026 covered a Muscat SCADA upgrade, an inter-governorate water interconnection, pipe replacement in Barka and network extensions.
05
Sustainability & Resilience
Energy dominates the company’s environmental footprint. Electricity accounts for 80.8% of its direct emissions, ahead of vehicle fuels and treatment processes, and water services consume more electricity than wastewater services. Its strategic objectives include reducing pollution from traditional sanitation and protecting groundwater, and it manages the Al Ansab Wetland as a natural conservation area, while its supply of treated effluent reduces freshwater demand in non-potable uses. The company has also published a Sustainable Finance Framework, dated 2024.
06
Key Challenges
- Reducing water losses, which at 37.10% in 2024 remained above that year’s 35.00% target.
- Maintaining supply continuity and drinking-water compliance across a nationwide service area.
- Delivering network extensions, SCADA and interconnection works through an active tender programme.
- Sustaining financial stability under price control after the 2024 debt restructuring.
- Expanding treated wastewater reuse beyond the 53% utilisation reached in 2025.
