ONAS Southern Sanitation Concession
Wastewater treatment + reuse, 14 treatment plants, 106 pumping stations and about 1,900 km of sewers, treating 39 million m3/year for 960,000 people in Tunisia.
Operational
The record
- Country
- Tunisia
- Location
- Sfax, Gabès, Medenine and Tataouine
- Coordinates
- —
- Technology
- Wastewater treatment + reuse
- Capacity
- 14 treatment plants, 106 pumping stations and about 1,900 km of sewers, treating 39 million m3/year for 960,000 people
- Capital cost
- US$220 million
- Stage
- Operational
- Owner or client
- ONAS
- Contractor
- SCAST, the concession company formed by SUEZ (80 per cent), Segor and groupe SCET (12 per cent) and BIAT (8 per cent)
- Operator
- Societe de Concession d'Assainissement du Sud Tunisien (SCAST)
- Finance
- World Bank for rehabilitation and extension works, Tunisian state for operation and maintenance
- Award or start year
- 2023
- Commissioned
- —
Record last checked 2026-09-18.
History
- 2023-04
Concession contract signed by ONAS and the SUEZ-led consortium on 26 April 2023
- 2024-01
Public consultation held at the Sfax governorate
- 2024-03
Environmental and social management plan issued for the first rehabilitation works at Sfax Nord
Sources
6 references
Every field in the record above is taken from the references below. A field that none of them confirms prints as a dash.
- SUEZ, SUEZ et l'Office National de l'Assainissement de la Tunisie signent le premier partenariat public-prive dans le secteur de l'eau en Tunisie, 26 Apr 2023. suez.com.
- Ten year concession worth EUR 200 million covering collective sanitation in Sfax, Gabes, Medenine and Tataouine for 960,000 people; 14 treatment plants, 106 pumping stations and 1,900 km of network treating 39 million m3/year; World Bank finances rehabilitation and extension, the Tunisian state operation and maintenance; consortium SUEZ 80 per cent, Segor and groupe SCET 12 per cent, BIAT 8 per cent; the contract adds tertiary treatment with ultraviolet disinfection and phosphorus removal to allow agricultural reuse.
- ONAS and SCAST, Concession de l'exploitation d'ouvrages d'assainissement collectif, Lot 2 Sud, March 2024. onas.nat.tn.
- Names the concession company SCAST, gives the perimeter as 14 plants, 106 pumping stations and 1,898 km of sewers in Sfax, Gabes and Medenine, and sets contractual effluent guarantees of 125 mg/l COD, 30 mg/l BOD and 30 mg/l suspended solids 18 months after the contract takes effect.
- Instance Generale de Partenariat Public Prive, Concession de l'exploitation d'ouvrages d'assainissement collectif. igppp.tn.
- MENA Water Review major projects register and PPP pipeline — compiled from procurer publications, development-bank project pages and trade reporting; each record names its source.
Sets the policy context, with ONAS operating 115 treatment plants serving 167 municipalities and 9 million population equivalent at the end of 2016. USD figure converted from EUR 200 million at about 1.10 dollars to the euro in April 2023.