ONAS — Office National de l’Assainissement du Sénégal
Full administration profile
Khountou score
Ranked 1st of 4 administrations in the Water & Sanitation sector
Response rate
89%
Average processing time
2.1 days
Published responses
312
Reports followed
276
- Sector
- Water & Sanitation
- Head office region
- Dakar
- Status
- Public industrial and commercial institution (EPIC)
- Founded
- 1966
The Office National de l’Assainissement du Sénégal (ONAS) is responsible for the sustainable management of the public sanitation service for wastewater, stormwater and drainage. It operates in urban and peri-urban areas to improve living conditions and protect the environment.
1. Performance summary
Reports received
276
+12 this month
Response rate
89%
+5 pts this month
Average time
2.1 days
-0.4 days this month
Published responses
312
+18 this month
Reports by status
- Resolved156 (57%)
- In progress98 (36%)
- Pending22 (8%)
- Rejected0 (0%)
5. Khountou score trend
2. Recent reports
| Report subject | Category | Status | Date | Views | Actions |
|---|---|---|---|---|---|
| Débordement d’eaux usées à Grand-Yoff | Sewage overflow | Resolved | 21 May 2025 | 128 | |
| Canal bouché à Pikine | Blocked pipe | In progress | 20 May 2025 | 92 | |
| Inondation récurrente à Rufisque | Flooding | In progress | 19 May 2025 | 156 | |
| Mauvaises odeurs près d’un collecteur à Medina | Bad smells | Resolved | 18 May 2025 | 76 | |
| Égout à ciel ouvert à Parcelles Assainies | Open sewer | In progress | 17 May 2025 | 114 |
3. Responses from the administration
Response to report #ONAS-2025-2487
21 May 2025Nos équipes sont intervenues sur le site. Le problème provenait d’un bouchon dans le collecteur secondaire.
View the responseResponse to report #ONAS-2025-2461
21 May 2025Le curage du caniveau est programmé pour cette semaine. Merci pour votre patience.
View the responseResponse to report #ONAS-2025-2433
20 May 2025Une équipe a été mobilisée pour pomper les eaux stagnantes. Un curage du réseau est planifié.
View the response
4. Commitments and corrective actions
6. Practical information
- Address
- Route de l’Aéroport Léopold Sédar Senghor, BP 3152, Dakar – Sénégal
- Phone
- +221 33 859 52 00
- Website
- www.onas.sn
- contact@onas.sn
- Opening hours
- Mon – Fri: 07:30 – 16:00
- Social networks
- ONAS Sénégal
7. Areas of operation
Present in 14 regions of Senegal
Dakar, Thiès, Diourbel, Fatick, Saint-Louis, Kaolack, Ziguinchor, Kolda, Tambacounda, Louga, Matam, Kédougou, Sédhiou, Kaffrine