Sewerage: the largest employers in Wallonia
As of 12 Nov 2026, 34 companies in Sewerage (NACE 37) in Wallonia report employees in recent accounts (financial years 2025 to 2026). The 10 largest employers account for 1,120.4 FTE, out of 1,211.8 for all of them; median headcount is 5.4 FTE. in BW Association Intercommunale leads with 488 FTE (financial year 2025).
Top 34 · Sewerage · Wallonia
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 | in BW Association Intercommunale 1400 Nivelles | €576.1m | €135.7m | €219.5m | 488.0 | 2025 |
| 2 | 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 |
| 3 | IDELUX Eau 6700 Arlon | €115.5m | €26.3m | €50.6m | 101.2 | 2025 |
| 4 | Societe Publique de Gestion de l'Eau 4800 Verviers | €4.06bn | €450.2m | €2.14bn | 65.0 | 2025 |
| 5 | Wiame Net 5060 Sambreville | €4.15m | — | −839,130 € | 58.7 | 2025 |
| 6 | Eloy Water 4140 Sprimont | €13.3m | €47.8m | €7.63m | 50.6 | 2025 |
| 7 | Henri Schmetz 4850 Plombières | €2.78m | — | €1.71m | 22.5 | 2025 |
| 8 | Vidange Warzee 5363 Hamois | €3.10m | — | 136,563 € | 20.0 | 2025 |
| 9 | Pipe Consult 4821 Dison | €2.94m | — | 892,776 € | 15.2 | 2025 |
| 10 | Vidange Nette 7332 Saint-Ghislain | €2.32m | — | 664,121 € | 14.8 | 2025 |
| 11 | Vidange Efficace 1300 Wavre | €1.61m | — | 552,165 € | 13.7 | 2025 |
| 12 | Demuynck et Fils 7712 Mouscron | 699,106 € | — | 327,621 € | 10.0 | 2025 |
| 13 | Vidange Rary 6534 Thuin | €3.07m | €23.9m | €2.13m | 8.0 | 2025 |
| 14 | HTC Seneffe 7170 Manage | €2.06m | — | 506,122 € | 7.1 | 2025 |
| 15 | De Bree Solutions Wallonie 7700 Mouscron | €1.08m | — | −533,043 € | 6.8 | 2025 |
| 16 | Entreprises D. Poncelet 4032 Liège | 498,304 € | — | 149,206 € | 6.7 | 2025 |
| 17 | Vidange Inter 6040 Charleroi | 788,566 € | — | 331,557 € | 6.0 | 2025 |
| 18 | Vidange Brutout 1440 Braine-le-Château | 796,231 € | — | 570,783 € | 4.8 | 2025 |
| 19 | Idrabel 1300 Wavre | 589,751 € | — | 365,579 € | 4.2 | 2025 |
| 20 | Aquacur 5380 Fernelmont | 939,291 € | — | 76,687 € | 3.3 | 2025 |
| 21 | HTC Wallonie 4041 Herstal | €3.34m | — | 619,227 € | 3.1 | 2025 |
| 22 | AB...z Concept 4020 Liège | 183,113 € | — | 76,014 € | 3.0 | 2025 |
| 23 | Vidange Eclair 7522 Tournai | 687,400 € | — | 404,890 € | 2.0 | 2025 |
| 24 | Vidange Botton 5330 Assesse | 500,718 € | — | 386,291 € | 2.0 | 2025 |
| 25 | Vidange Eco-Pro 5150 Floreffe | 428,297 € | — | 345,802 € | 2.0 | 2025 |
| 26 | Debouch'Tout 4031 Liège | 425,920 € | — | 298,180 € | 2.0 | 2025 |
| 27 | ATB Belgique 4900 Spa | 407,081 € | €2.10m | 20,815 € | 1.9 | 2025 |
| 28 | Zinaqua 4140 Sprimont | 59,375 € | — | −140,288 € | 1.2 | 2025 |
| 29 | Vidange Willy 6210 Les Bons Villers | 726,238 € | — | 355,926 € | 1.0 | 2025 |
| 30 | BMC Services 1310 La Hulpe | 47,892 € | — | −51,421 € | 1.0 | 2026 |
| 31 | La Vidange Gillicienne 6200 Châtelet | 127,335 € | — | 74,796 € | 0.8 | 2025 |
| 32 | DICD 7060 Soignies | 144,748 € | — | 17,688 € | 0.3 | 2025 |
| 33 | La Belle Vidange 6224 Fleurus | 461,178 € | 304,113 € | 46,300 € | 0.3 | 2025 |
| 34 | Eau de VIE 1490 Court-Saint-Étienne | 99,255 € | — | 37,256 € | 0.2 | 2025 |
Ranking based on each company's own annual accounts (statutory, not consolidated): a subsidiary and its parent appear separately, and the ranking differs from lists based on consolidated group accounts. 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.
Sewerage across Belgium → All sectors · Wallonia →
Other sectors · Wallonia
- 01 Crop and animal production, hunting and related service activities780
- 02 Forestry and logging194
- 08 Other mining and quarrying77
- 10 Manufacture of food products964
- 11 Manufacture of beverages98
- 13 Manufacture of textiles81
- 14 Manufacture of wearing apparel32
- 16 Manufacture of wood and of products of wood and cork, except furniture; manufacture of articles of straw and plaiting materials221
- 17 Manufacture of paper and paper products44
- 18 Printing and reproduction of recorded media183
- 20 Manufacture of chemicals and chemical products154
- 21 Manufacture of basic pharmaceutical products and pharmaceutical preparations70
- 22 Manufacture of rubber and plastic products140
- 23 Manufacture of other non-metallic mineral products267
- 24 Manufacture of basic metals97
- 25 Manufacture of fabricated metal products, except machinery and equipment863
- 26 Manufacture of computer, electronic and optical products110
- 27 Manufacture of electrical equipment94
- 28 Manufacture of machinery and equipment n.e.c.245
- 29 Manufacture of motor vehicles, trailers and semi-trailers62
- 30 Manufacture of other transport equipment32
- 31 Manufacture of furniture148
- 32 Other manufacturing184
- 33 Repair, maintenance and installation of machinery and equipment290
- 35 Electricity, gas, steam and air conditioning supply55
- 38 Waste collection, recovery and disposal activities185
- 39 Remediation activities and other waste management service activities12
- 41 Construction of residential and non-residential buildings1,633
- 42 Civil engineering230
- 43 Specialised construction activities4,770
- 46 Wholesale trade3,107
- 47 Retail trade6,425
- 49 Land transport and transport via pipelines955
- 50 Water transport13
- 52 Warehousing, storage and support activities for transportation248
- 53 Postal and courier activities44
- 55 Accommodation497
- 56 Food and beverage service activities3,657
- 58 Publishing activities116
- 59 Motion picture, video and television programme production, sound recording and music publishing activities116
- 60 Programming, broadcasting, news agency and other content distribution activities19
- 61 Telecommunication45
- 62 Computer programming, consultancy and related activities855
- 63 Computing infrastructure, data processing, hosting and other information service activities56
- 64 Financial service activities, except insurance and pension funding460
- 65 Insurance, reinsurance and pension funding, except compulsory social security30
- 66 Activities auxiliary to financial services and insurance activities977
- 68 Real estate activities1,204
- 69 Legal and accounting activities1,756
- 70 Activities of head offices and management consultancy1,073
- 71 Architectural and engineering activities; technical testing and analysis709
- 72 Scientific research and development141
- 73 Activities of advertising, market research and public relations285
- 74 Other professional, scientific and technical activities118
- 75 Veterinary activities173
- 77 Rental and leasing activities148
- 78 Employment activities145
- 79 Travel agency, tour operator and other reservation service and related activities124
- 80 Investigation and security activities39
- 81 Services to buildings and landscape activities738
- 82 Office administrative, office support and other business support activities285
- 84 Public administration and defence; compulsory social security25
- 85 Education560
- 86 Human health activities1,816
- 87 Residential care activities621
- 88 Social work activities without accommodation415
- 90 Arts creation and performing arts activities144
- 91 Libraries, archives, museums and other cultural activities62
- 92 Gambling and betting activities27
- 93 Sports activities and amusement and recreation activities459
- 94 Activities of membership organisations223
- 95 Repair and maintenance of computers, personal and household goods, and motor vehicles and motorcycles523
- 96 Personal service activities823
Municipalities with the most companies in the sector · Wallonia
- 4020 Liège (Bressoux, Jupille-Sur-Meuse, Wandre)3
- 1300 Wavre (Limal)2
- 1380 Lasne (Couture-Saint-Germain, Lasne-Chapelle-Saint-Lambert, Maransart, …)2
- 1400 Nivelles (Monstreux)2
- 4000 Liège (Glain, Rocourt)2
- 4041 Herstal (Milmort, Vottem)2
- 4140 Sprimont (Dolembreux, Gomzé-Andoumont, Rouvreux)2
- 4800 Verviers (Ensival, Lambermont, Petit-Rechain, …)2
- 4850 Plombières (Montzen, Moresnet)2
- 5020 Namur (Champion, Daussoulx, Flawinne, …)2
- 5380 Fernelmont (Bierwart, Cortil-Wodon, Forville, …)2
- 1310 La Hulpe1
Frequently asked questions
Which is the largest employer in Sewerage in Wallonia?
Among companies, in BW Association Intercommunale, with 488 full-time equivalents reported (financial year 2025).
Are all the jobs located in the area?
Not necessarily: headcount is reported by the company for all its sites, and the company is ranked by the address of its registered office. 34 out of 70 companies in the sector report employees there.
Why does this ranking differ from other lists?
It uses each company's annual accounts as filed with the National Bank, not consolidated group accounts. A holding, a subsidiary or a purchasing entity can therefore appear separately. Only companies whose latest accounts are less than 3 years old are ranked.
Analyse companies · Wallonia
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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 12 Nov 2026.