- A Blue World Company
- Aan de Stegge Bouw en Werktuigbouw
- Afmitech Friesland
- AkaNova
- Aqana
- ATB Nederland
- AWT Watertreatment
- BLUE-tec
- Brightwork
- BWA
- DMT Environmental Technology
- Flovac
- H2Motion
- InnBlue
- I-Real BV
- KNN Cellulose
- Landustrie Sneek
- LeAF
- LG Sonic
- Membrane Systems Europe BV
- RWB Special Products
- RWB Water Services
- Water Knight
- Waterschap Noorderzijlvest
- Wetlantec
- Wetterskip Fryslân