Sewerage: the largest employers in Flemish Brabant
As of 14 Nov 2026, 12 companies in Sewerage (NACE 37) in Flemish Brabant report employees in recent accounts (financial years 2023 to 2025). The 10 largest employers account for 129.3 FTE, out of 130.1 for all of them; median headcount is 3.8 FTE. Longin Service leads with 43.7 FTE (financial year 2025).
Top 12 · Sewerage · Flemish Brabant
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 | Longin Service 3012 Leuven | €7.87m | — | €5.27m | 43.7 | 2025 |
| 2 | A.B. Maxi Cleaning 1930 Zaventem | €16.2m | €16.7m | €10.1m | 39.8 | 2025 |
| 3 | Ecosoft 22 1930 Zaventem | €6.00m | — | 336,279 € | 12.4 | 2025 |
| 4 | Rio Ulens 3400 Landen | 703,628 € | — | 264,380 € | 9.7 | 2025 |
| 5 | The Flow Group - Eco Solutions 3200 Aarschot | €1.25m | — | 180,279 € | 9.4 | 2025 |
| 6 | De Wever Guido 1742 Ternat | €1.74m | — | 793,171 € | 3.8 | 2025 |
| 7 | Braco Cleaning Service 3460 Bekkevoort | €1.30m | — | 969,458 € | 3.7 | 2025 |
| 8 | Rioolexpert 3110 Rotselaar | 234,588 € | — | −48,308 € | 3.5 | 2025 |
| 9 | Van der Cruyssen F. 1730 Asse | 339,381 € | — | 233,798 € | 2.0 | 2025 |
| 10 | Hydro JET 1861 Meise | €1.60m | — | €1.50m | 1.3 | 2025 |
| 11 | Clement Cleaning 1761 Roosdaal | 132,430 € | — | 68,953 € | 0.5 | 2025 |
| 12 | Services Janssens 3090 Overijse | 23,998 € | — | 17,141 € | 0.3 | 2023 |
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 · Flemish Brabant →
Other sectors · Flemish Brabant
- 01 Crop and animal production, hunting and related service activities186
- 10 Manufacture of food products245
- 11 Manufacture of beverages30
- 13 Manufacture of textiles16
- 16 Manufacture of wood and of products of wood and cork, except furniture; manufacture of articles of straw and plaiting materials40
- 17 Manufacture of paper and paper products24
- 18 Printing and reproduction of recorded media63
- 20 Manufacture of chemicals and chemical products29
- 22 Manufacture of rubber and plastic products42
- 23 Manufacture of other non-metallic mineral products45
- 24 Manufacture of basic metals11
- 25 Manufacture of fabricated metal products, except machinery and equipment158
- 26 Manufacture of computer, electronic and optical products50
- 27 Manufacture of electrical equipment31
- 28 Manufacture of machinery and equipment n.e.c.90
- 29 Manufacture of motor vehicles, trailers and semi-trailers16
- 30 Manufacture of other transport equipment10
- 31 Manufacture of furniture59
- 32 Other manufacturing64
- 33 Repair, maintenance and installation of machinery and equipment73
- 38 Waste collection, recovery and disposal activities34
- 41 Construction of residential and non-residential buildings578
- 42 Civil engineering84
- 43 Specialised construction activities1,405
- 46 Wholesale trade1,557
- 47 Retail trade1,707
- 49 Land transport and transport via pipelines531
- 51 Air transport11
- 52 Warehousing, storage and support activities for transportation112
- 53 Postal and courier activities33
- 55 Accommodation75
- 56 Food and beverage service activities1,274
- 58 Publishing activities40
- 59 Motion picture, video and television programme production, sound recording and music publishing activities62
- 61 Telecommunication32
- 62 Computer programming, consultancy and related activities590
- 63 Computing infrastructure, data processing, hosting and other information service activities37
- 64 Financial service activities, except insurance and pension funding229
- 66 Activities auxiliary to financial services and insurance activities292
- 68 Real estate activities439
- 69 Legal and accounting activities479
- 70 Activities of head offices and management consultancy543
- 71 Architectural and engineering activities; technical testing and analysis264
- 72 Scientific research and development38
- 73 Activities of advertising, market research and public relations177
- 74 Other professional, scientific and technical activities51
- 75 Veterinary activities56
- 77 Rental and leasing activities63
- 78 Employment activities49
- 79 Travel agency, tour operator and other reservation service and related activities41
- 80 Investigation and security activities22
- 81 Services to buildings and landscape activities286
- 82 Office administrative, office support and other business support activities146
- 85 Education106
- 86 Human health activities483
- 87 Residential care activities91
- 88 Social work activities without accommodation133
- 90 Arts creation and performing arts activities47
- 91 Libraries, archives, museums and other cultural activities14
- 93 Sports activities and amusement and recreation activities110
- 94 Activities of membership organisations64
- 95 Repair and maintenance of computers, personal and household goods, and motor vehicles and motorcycles152
- 96 Personal service activities282
Municipalities with the most companies in the sector · Flemish Brabant
- 1930 Zaventem (Nossegem)6
- 1640 Sint-Genesius-Rode (Rhode-Saint-Genèse)3
- 1761 Roosdaal (Borchtlombeek)2
- 1970 Wezembeek-Oppem2
- 1570 Pajottegem (Galmaarden, Tollembeek, Vollezele)1
- 1700 Dilbeek (Sint-Martens-Bodegem, Sint-Ulriks-Kapelle)1
- 1730 Asse (Bekkerzeel, Kobbegem, Mollem)1
- 1742 Ternat (Sint-Katherina-Lombeek)1
- 1760 Roosdaal (Onze-Lieve-Vrouw-Lombeek, Pamel, Strijtem)1
- 1800 Vilvoorde (Peutie)1
- 1861 Meise (Wolvertem)1
- 1950 Kraainem1
Frequently asked questions
Which is the largest employer in Sewerage in Flemish Brabant?
Among companies, Longin Service, with 43.7 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. 12 out of 29 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 · Flemish Brabant
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 14 Nov 2026.