Office National de l'Assainissement http://www.onas.nat.tn 2023-06-10 A financing agreement between the republic of Tunisia and the bank 2024-02-16 Dinner debate on “the development of the sanitation sector and the Reuse of treated wastewater: challenges, perspectives and funding”. 2024-02-16 A loan and guarantee had been signed between the Republic of Tunisia and the African development (ADB) 2023-08-22 Mission d'un Consultant technique pour la sauvegarde environnementale et sociale pour le lot2 Sud de la Tunisie du projet de concession 2023-08-22 Mission d'un auditeur pour la sauvegarde environnementale et sociale du projet de concession 2023-11-08 KFW cooperation 2023-11-08 Treated Waste Water Quality Improvement Project II 2025-07-22 Monitoring the Implementation of the DEPOLMED Program: Technical Workshops for Evaluation and Progress Review 2025-09-01 Circular Note No. 7: Call for tenders for the conclusion of a Partnership Agreement for the Design, Construction, Financing, Operation, Upkeep and Maintenance of the TUNIS NORD Wastewater Treatment Plant in El Hessiane and the Upkeep, Maintenance and Management of Ancillary Facilities. 2025-10-28 WASTEWATER SANITATION STUDY FOR MENZEL M’HIRI AND NASRALLAH IN THE KAIROUAN GOVERNORATE - Environmental and Social Impact Assessment (ESIA) (in French) 2025-10-31 Circular Note No. 8: Call for Tenders for the Conclusion of a Partnership Contract for the Design, Construction, Financing, Operation, Maintenance, and Upkeep of the TUNIS NORTH Wastewater Treatment Plant in El Hessiane, as well as the Maintenance and Management of the Related Facilities. 2025-12-03 Circular Note No. 9 (in French) 2026-01-16 As part of the Small Towns Sanitation Program for municipalities with fewer than 10,000 inhabitants – Phase I, the Environmental and Social Impact Studies (ESIA) of the municipality of Bir Ali Ben Khalifa (Sfax Governorate) were approved by the African Development Bank (AfDB) and the National Agency for Environmental Protection (ANPE) 2025-07-21 ONAS and KfW Join Forces to Optimize the Operation of Cogeneration Treatment Plants 2025-05-20 Progress in sanitation for small towns ! 2025-02-20 Field visit of a delegation from the African Development Bank to the Khalidia purification station. 2025-05-10 Energy Efficiency Program 2025-05-20 Hesiane Circular Note No. 6 2023-05-30 بلاغ نشر نتائج الإنتقاء الأوّلي لخطّة متصرّف 2023-05-30 بلاغ نشر نتائج الإنتقاء الأوّلي لخطّة مهندس مساعد 2023-05-30 بلاغ نشر نتائج الإنتقاء الأوّلي لخطّة مهندس أوّل 2023-05-09 Formation 2023-02-24 Monitoring mission of the environmental and social aspect of the projects 2015-08-13 Commissioning of the greatest sanitation complex in Tunisia by 100% female team 2015-06-29 A memorandum was signed with ADB 2015-06-11 Visit of Mr LOIC FAUCHON 2015-05-21 Mr Habib OMRANE takes office as new Chief Executive Officer (CEO) of the National Sanitation Utility 2015-05-22 KFW delegation visited ONAS 2015-06-01 Onas Projects at the Exhibition for Environment & Energy 2015-05-27 AFD delegation visited ONAS 2015-09-11 Field visit to the city Bousalem 2015-09-23 ONAS participation at The 3rd Congress WOPS 2016-01-27 ONAS projects during the period 2016-2020 2015-11-27 German Delegation visited Kairouan wastewater treatment plant 2015-11-16 Completion of initial measures associated to the sanitation programme for 9 industrial zones 2015-10-28 Swiss grant agreemant to finance sanitation project inTajerouine 2015-10-27 Sanitation Measures forTestour small town 2015-10-01 Preparations for Autumn Rains 2019-08-16 The Environment Support Program - priority sanitation projects 2019-12-19 The first prize for ONAS 2020-04-27 RESETTLEMENT POLICY FRAMEWORK Result of invitations to tender 2020-04-30 Result of invitations to tender 2020-06-25 The notice of international interest of engineering offices 2019-10-02 Monitoring Mission of the German Development Bank (KfW) 2019-11-20 ONAS participation at the International Exhibition 2019-01-22 Visit of a Portuguese delegation to the Mornaguia Wwtp 2020-07-21 call of tenders for the appointment of an external auditor 2019-11-29 Workshop on the start-up of MENAWARA project in Tunisia 2019-11-28 Workshop on the start-up of MENAWARA project in Tunisia 2019-11-22 An agreement signature with KfW Non Conventional WAter Re-use in Agriculture in MEditerranean countries 2019-10-10 A Visit of Senegalese delegation 2019-10-24 Workshop on the start-up of sanitation programme of small cities less than 10 000 inhabitants 2019-11-14 Participation au séminaire « La gestion de l'eau et des eaux usées » 2019-11-14 ONAS participation at the International Exhibition of Activities and Technologies on Water 2019-11-13 Participation in the African Investment Forum 2022-09-29 Pouring works of the decanter wall within the framework of MENAWARA project 2022-06-16 بلاغ إطلاق الاستشارة العمومية حول الخدمات الإدارية الموجهة للمواطن والمؤسسة لوزارة البيئة 2022-03-17 Energy efficiency 2022-03-18 Sanitation of Bni Mtir 2021-03-30 Participation at a scientific activity 2022-05-13 ABD and EBRD monitoring mission 2022-06-06 Technical visit at GDA Sidi Amor 2021-12-24 Avis d'appel d'offres et le dossier relatif à « la désignation des avocats ou de société d'avocats 2022-04-28 The aquatic environment in the interior regions and the rehabilitation of wastewater facilities in 10 municipalities 2021-05-26 Tunisian-libian cooperation 2022-03-23 The monitoring of the progress of "Menawara" project 2021-12-24 Meetings on 30 November and 20 December2021 21/09/2021 - 23/09/2 The fifth edition of the Arab Water Forum 2022-09-26 Within the framework of MENAWARA project, the realization of living-lab and planning of the demonstration plot at WWTplant Choutrana 2 2020-09-30 AFD new director visits The Southern Meliane WWTP 2021-10-14 Tunisia Guest of honor In pollutec Lyon. 2021 23/09/2 The fifth edition of the Arab Water Forum 2020-11-25 The official start of rehabilitation and extension works – WWWTP southern Meliane 2021-06-09 Tuniso-czech cooperation 2021-11-19 Participation in the Franco-African water and sanitation sector meeting 2021-02-26 A meeting in the Regional Delegation of Agriculture in Nabeul 2022-09-30 Notice of the results of the consultation N ° 001/2019 5 Concession project for the Tunis North and South Tunisian lots 2022-11-29 A working mission of the central committee of the Menawara project 2015-03-18 ONAS participation at JICA workshop 2015-03-11 ONAS chief executive Officer intervention in radio Shems FM 2015-02-12 The inception of Thala and Feriana sanitation project 2015-01-28 Workshop on the Sludge management in Greater Tunis 2011-08-15 Add-file application for recruiting examination 2012-04-06 Evaluation of sanitation projects co-financed with the German Development Bank « KFW » : 2012-04-04 Cooperation with JICA 2012-05-07 ONAS programmes at Greenery, Pool and Environment Expo 2012-05-07 ONAS programmes at Greenery, Pool and Environment Expo 2012-06-29 workshop on the technical feasibility study on 9 industrial zones wastewater treatment 2012-09-07 Information day on the study of the Greater Tunis Sanitation Master Plan updating 2013-04-10 Onas Projects at the Mediterranean Exhibition for Water 2013-04-29 The Palestinian Minister of the Environment visited ONAS 2012-04-25 An Omani delegation interested by ONAS quality management programme 2012-01-26 ONAS chooses e-GEE solution 2011-11-16 cooperation under WOP alliance 2011-12-07 Cooperation between ONAS and SIAAP 2012-01-18 The inception of the industrial wastewater treatment technical feasibility study List of agreements 2012-01-18 Training session for an Iraqi delegation : 2012-02-15 The Minister for Construction, Sanitation and Urban Planning of the Ivory Coast visited ONAS 2012-03-15 ONAS participation at the 6th World Water Forum 2013-05-10 Jordanian delegation visit in Tunisia for experience exchange 2013-09-27 Several Financial Partner Delegations Visit to ONAS 2014-06-20 Training workshop on Public Private Partnership in the Sanitation Facilities Management 2014-08-06 German Parliament member visited Kairouan wastewater treatment plant 2014-09-10 APPOINTMENT OF ONAS CHIEF EXECUTIVE OFFICER 2014-11-18 Benin delegation's study trip 2014-11-27 A Grant agreement was signed with AFD : 2014-11-25 Coordination of the sanitation programme for 9 industrial zones 2015-01-22 workshop on industrial wastewater treatment plants 2014-06-19 Closure seminar of Tunisia & European Union twinning project on development of environmental protection 2014-06-05 Onas Projects at the Exhibition for Environment & Energy 2014-05-29 Promotion of treated wastewater and sludge reuse for agriculture purposes 2013-10-22 Inception of WIKTI workshops in ONAS 2014-02-26 Supervision mission of a Swiss delegation 2014-04-01 workshop on the reuse of treated wastewater 2014-04-14 A new cooperation agreement between SIAAP & ONAS 2014-05-06 Public Private Partnership in the Sanitation Facilities Management 2014-05-13 Information day on the study of the Greater Tunis Sanitation Master Plan updating 2014-05-28 A visit to Western North sanitation facilities 2011-06-10 ONAS certification with quality’s label “ Marhaba” 2011-05-16 JICA delegation visits ONAS 2011-03-06 The French Minister of Ecology, Sustainable Development, Transport and Housing visited Tunisia 2010-12-16 World Bank delegation visited the wastewater treatment plant “El Attar” 2010-12-10 The General Manager of AFD visited Tunisia 2010-10-20 A Grant agreement was signed with the World Bank 2010-10-19 Mauritanian delegation visits ONAS 2010-06-23 An Information day in Nabeul on the environmental impact study 2010-06-23 Training session for a Syrian delegation : 2010-06-23 Tunisian – Lebanese cooperation : Lebanese delegation visits ONAS 2010-06-22 Training session for a Syrian delegation : 2010-06-21 An Information day on “Neptune” application 2015-06-05 Inception of works (wwtp) 2011-08-09 Initiating operation of new wastewater treatment plants 2010-05-21 A delegation of the Chamber of the Senat visited ONAS wastewater treatment plants. 2010-05-21 an information day on “The geographic information system 2015-06-05 Initiating operation of new wastewater treatment plants 2010-05-21 A delegation of the Chamber of the Senat visited ONAS wastewater treatment plants. 2010-04-30 An economic and social impact study is implemented 2010-04-30 An economic and social impact study is implemented 2010-04-08 A supervision mission of a World Bank delegation 2010-04-08 A supervision mission of a World Bank delegation 2010-04-06 An evaluation mission of a World Bank delegation 2010-03-22 A cooperation agreement was signed with European Investment Bank 2010-03-22 a meeting on the evaluation of a technical assistance mission 2010-03-22 a meeting on the evaluation of a technical assistance mission 2010-03-22 A cooperation agreement was signed with European Investment Bank 2010-03-19 ONAS delegation visited Benin to present the final report : 2010-03-19 ONAS delegation visited Benin to present the final report : 2010-03-05 A delegation of the Chamber of deputies visited the wastewater treatment plant in Choutrana. 2010-02-27 Updating the Master Plan of Greater Tunis 2010-02-12 Training session for an Iraqi delegation 2010-01-14 Organisation of a consultation meeting 2010-01-14 Organisation of a consultation meeting 2010-01-07 ONAS participation at the 4th Islamic Conference of Environment Ministers 2009-12-25 ONAS signed an agreement with TUNISIA TELECOMMUNICATION 2009-12-25 ONAS signed an agreement with TUNISIA TELECOMMUNICATION 2009-12-15 The Minister of the Palestinian Water Authority visited ONAS 2009-12-15 The Minister of the Palestinian Water Authority visited ONAS 2009-12-14 ONAS delegation visted Benin 2009-12-14 ONAS delegation visted Benin 2009-11-19 workshop on South- South Cooperation in the field of sanitation and water management: 2009-11-19 workshop on South- South Cooperation in the field of sanitation and water management: 2009-10-27 Loan and grant agreements signed with AFD& The European Community : 2009-10-27 Loan and grant agreements signed with AFD& The European Community : 2009-09-25 A Grant agreement was signed with the German Development Bank 2009-09-25 A Grant agreement was signed with the German Development Bank 2009-09-09 A Grant agreement was signed with AFD 2009-07-23 German Development Bank “ KFW” delegation visited ONAS 2009-07-23 German Development Bank 2009-07-10 organisation of an information day 2009-07-10 Organisation of an information day 2009-07-08 German development Bank 2009-07-08 German development Bank 2009-06-05 : the celebration of the National and world Environment Day Programme 05-06-2009 the celebration of the National and world Environment Day Programme 2009-06-04 ONAS participation at the National seminar 2009-06-04 ONAS participation at the National seminar 2009-04-30 Information day for environmental journalists 2009-02-17 International conference on the transfer and reuse of treated wastewater 2009-01-18 ONAS participation at the International Exhibition of water & sanitation technologies, Casablanca- Morocco 2008-12-25 Training session for an Iraqi delegation : 2008-12-25 Training session for an Iraqi delegation : 2008-11-20 AFD delegation visits the wastewater treatment plant of Southern Meliane 2008-10-31 Training session for an Iraqi delegation : 2008-10-31 Training session for an Iraqi delegation : 2008-10-18 ONAS participation at the National exhibition for the set up of Entreprises: 2008-06-07 Seminar organization 2008-06-07 Seminar organization 2008-05-30 Training session for an Algerian delegation : 2008-05-30 Training session for an Algerian delegation : 2008-05-29 The celebration of the National and world Environment Day Programmme June 2008 2008-05-26 The French development Agency issues a new environment credit line 2008-05-26 : Emirates- Tunisia Coopeartion 2008-05-26 Emirates- Tunisia Coopeartion 2008-05-23 ONAS participation in Algiers-Pollutec 2008: 2008-04-18 The German universities alumnus visit the wastewater treatment plant in Zriba 2008-04-18 The German universities alumnus visit the wastewater treatment plant in Zriba 2008-04-16 April 15-17, 2008 :A Romanian delegation visited the industrial wastewater treatment plant in Ben Arous. 2008-04-16 April 15-17, 2008 :A Romanian delegation visited the industrial wastewater treatment plant in Ben Arous. 2008-04-01 March 26-28,2008 : A senegalese delegation visited ONAS 2008-04-01 March 26-28,2008 : A senegalese delegation visited ONAS Study and Assessment Report 2008-03-18 Seminar organization 2008-03-18 Seminar organization 2007-11-26 a workshop 2007-11-15 seminar organization 2007-11-10 a workshop 2007-10-18 SECOND NOTICE OF ADJOURNMENT OF THE DEADLINE OF DELIVERY 2007-06-14 INTERNATIONAL CALL FOR PRE-QUALIFICATION APPLICATIONS NOTICE & PRELIMINARY INFORMATION MEMORANDUM 2007-06-05 Celebration of the National and world Enviornment Day 2007-06-05 Celebration of the National and world Enviornment Day 2007-05-04 The South Korean Minister of Environment visited the industrial wwtp of Ben Arous 2007-05-04 The South Korean Minister of Environment visited the industrial wwtp of Ben Arous 2007-04-22 Tunisian 2007-04-22 Tunisian – Malian cooperation 2019-08-19 World Bank Monitoring Mission (IBRD) 2019-08-16 The Environment Support Program - priority sanitation projects 2018-01-22 Visit of a Finnish delegation to the WWTP “ El ATTAR” 2018-03-28 Monitoring Mission of the French Development Agency 2018-03-01 Monitoring Mission of The EBRD 2018-02-21 Monitoring Mission of the German Development Bank (KfW) 2018-02-21 A Visit of Congolese delegation 2018-02-06 The call for applications to the ‘’Green Start-up’’ job program results 2018-01-30 Visit of a Portuguese delegation to the Chotrana Wwtp 2018-01-24 World Bank Mission 2017-12-19 Signature of a loan agreement with KfW 2018-04-26 Monitoring Mission of the German Development Bank (KfW) 2018-07-19 ONAS : New Chief Executive Officer 2019-01-22 Visit of a Portuguese delegation to the Mornaguia Wwtp 2019-07-19 Visit of Omani delegation to ONAS Visit of a Portuguese delegation to the Mornaguia Wwtp 2019-01-10 , Tunisian Governmant has signed a financing agreement with the African Development Bank and European Bank for Reconstruction and Development 2018-11-27 A memorandum was signed with the German Development Bank (KfW) 2018-11-27 Visit of Mr. Franc SECULA Minister Counselor at the Embassy of France 2018-08-30 KFW delegation visited ONAS 2018-08-17 AFD delegation visited ONAS 2017-12-08 Signature of a memorandum between ONAS, ADB and EBRD 2016-09-23 An agreement with the Association for Development and Environment 2016-10-06 "Al Jisr " a new ONAS call center 2016-10-06 Signature of a contract mandate with KfW 2016-10-06 An agreement with the Tunisian Association for the Protection of Nature and Environment of Korba 2016-10-14 Information Day about the 2016-09-23 Modern technologies for Sludge Solar Drying 2016-10-17 Monitoring Mission of the ADB 2016-10-24 Monitoring Mission of The EBRD 2016-11-14 Monitoring Mission of the German Development Bank (KfW) 2016-11-15 The ‘’SOS IJRAAT’' platform Launch 2016-11-22 World Bank Monitoring Mission (IBRD) 2016-12-01 The International Conference on Investment 2016-12-05 27th edition of POLLUTEC 2016-09-23 Monitoring Mission of the French Development Agency 2016-05-24 ONAS career management plan 2016-05-24 The « DEPOLMED » program 2016-05-24 ONAS career management plan 2016-05-24 Depolmed Program 2016-07-12 ONAS preparation for summer season 2016 ONAS preparation for summer season 2016 2016-07-20 Strengthening of ONAS capacity in industrial wastewater management 2016-07-25 Negotiation of an additional loan with the World Bank 2016-07-25 Upgrade of sanitation sector in the context of a "NAMA" 2016-12-02 ONAS participation in the International Conference on Investment « Tunisia 2020 » 2016-12-16 Information day about the "DEPOLVI" Project 2017-05-19 Monitoring Mission of the German Development Bank (KfW) 2017-05-22 Sanitation public-private partnership workshop Memorandum of understanding between ONAS, ANPE and CITET 2017-07-10 Public opinion poll on ONAS sanitation services 2017-07-14 EIB Monitoring Mission 2017-09-14 Monitoring Mission of the French Development Agency 2017-09-18 EIB Monitoring Mission 2017-09-20 National Conference on Treated Wastewater Reuse 2017-09-26 World Bank (IBRD) Monitoring Mission: 2017-10-13 Monitoring Mission of the German Development Bank (KfW) 2017-11-06 International Exhibition of Agriculture, Agricultural Machinery and Fishing 2017-11-24 Monitoring Mission of the German Development Bank (KfW) 2017-05-15 The 30 cities sanitation program 2017-04-25 Partnership Agreement between ONAS and ACDS 2017-04-26 visit of the KfW delegation 2016-12-23 Visit of a Palestinian delegation to ONAS 2017-01-10 A meeting with the World Bank 2017-01-10 The search for new technologies 2017-01-18 An agreement signature with KfW 2017-01-26 The Thala and Feriana/Telepte cities sanitation project 2017-02-03 Monitoring Mission of the ADB PUBLIC-PRIVATE PARTNERSHIP FOR THE OPERATION OF WASTEWATER FACILITIES PUBLIC-PRIVATE PARTNERSHIP FOR THE OPERATION OF WASTEWATER FACILITIES 2017-04-26 A Visit of Senegalese delegation 2017-04-17 Candidates Call « GREEN START UP » 2017-03-08 Monitoring Mission of the German Development Bank (KfW) 2017-02-22 Monitoring Mission of The EBRD 2017-02-22 Monitoring Mission of the French Development Agency 2017-02-22 World Bank Monitoring Mission (IBRD) 2015-06-16 Workshop on sanitation in rural area 2015-09-09 A GRANT AGREEMENT WAS SIGNED WITH EUROPEAN BANK FOR RECONSTRUCTION AND DEVELOPMENT