Sewerage: largest employers
115 Belgian companies in the sector (NACE 3700) report employees in recent accounts; here are the top 20. Aquafin leads with 1,207.3 FTE (financial year 2025).
Top 20
Ranked by average headcount (FTE) reported in the latest filed accounts (accounts less than 3 years old).
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | Aquafin 2630 Aartselaar | €4.48bn | €636.9m | €1.11bn | 1,207.3 | 2025 |
| 2 | in BW Association Intercommunale 1400 Nivelles | €576.1m | €135.7m | €219.5m | 488.0 | 2025 |
| 3 | Association Intercommunale Pour LE Demergement ET L'Epuration DES Communes DE LA Province DE Liege 4420 Saint-Nicolas | €454.1m | €78.7m | €140.4m | 284.4 | 2025 |
| 4 | Trevi 9050 Ghent | €25.6m | €36.2m | €9.92m | 129.0 | 2025 |
| 5 | TPF Utilities 1190 Forest | €20.1m | €32.3m | €8.19m | 118.6 | 2025 |
| 6 | IDELUX Eau 6700 Arlon | €115.5m | €26.3m | €50.6m | 101.2 | 2025 |
| 7 | Roefs 2030 Antwerp | €32.2m | €39.2m | €10.8m | 95.8 | 2025 |
| 8 | DE Bree Solutions 9990 Maldegem | €50.7m | €21.4m | €28.9m | 82.4 | 2025 |
| 9 | Dekeyser Waste Services 8200 Bruges | €6.36m | €11.3m | €1.76m | 69.5 | 2025 |
| 10 | Societe Publique DE Gestion DE L'EAU 4800 Verviers | €4.06bn | €450.2m | €2.14bn | 65.0 | 2025 |
| 11 | Wiame NET 5060 Sambreville | €4.15m | — | −839,130 € | 58.7 | 2025 |
| 12 | Lammertyn.NET 9120 Beveren-Kruibeke-Zwijndrecht | €5.83m | €10.0m | €3.11m | 57.4 | 2025 |
| 13 | Liekens 2370 Arendonk | €8.58m | €11.3m | €2.02m | 56.9 | 2025 |
| 14 | T.W.Z. 9940 Evergem | €108.6m | €22.3m | €82.4m | 54.8 | 2025 |
| 15 | Eloy Water 4140 Sprimont | €13.3m | €47.8m | €7.63m | 50.6 | 2025 |
| 16 | Longin Service 3012 Leuven | €7.87m | — | €5.27m | 43.7 | 2025 |
| 17 | A.B. Maxi Cleaning 1930 Zaventem | €16.2m | €16.7m | €10.1m | 39.8 | 2025 |
| 18 | Dranco 9000 Ghent | €18.9m | €1.45m | €2.31m | 34.0 | 2025 |
| 19 | Derudder Cleaning 8540 Deerlijk | €7.28m | — | €3.48m | 31.6 | 2025 |
| 20 | Aquamella 9090 Merelbeke-Melle | €2.81m | €5.47m | 777,221 € | 30.5 | 2025 |
Headcount reported by the company for all its sites: the jobs may be located elsewhere.
“—”: not published. Small companies (micro and abridged accounts) do not have to publish their revenue.
Frequently asked questions
Who is the largest employer in Sewerage?
Aquafin, with 1,207.3 full-time equivalents reported (financial year 2025).
How many Sewerage companies report employees?
115 out of 228, in accounts less than 3 years old.
Analyse companies in Sewerage
Filter these companies by size, soundness and trend, follow them and get an alert when their accounts or publications change.
Open the full file →Active companies (legal entities) that have filed at least one set of annual accounts, based on the Crossroads Bank for Enterprises and the National Bank of Belgium. The sector is the main activity in the register; the municipality is that of the registered office. Data updated on 11 Nov 2026.