- 374Water
- Aclarity
- AquaBlok
- Aquagga
- Aqua Metrology Systems (AMS)
- AECOM
- Aether Biomachines
- Allonia
- BioLargo
- Cabot Corporation
- Calgon Carbon
- Claros Technologies, Inc.
- CoreWater Technologies, Inc
- Cornelsen Umwelttechnologie GmbH
- Cyclopure
- Desotec
- Dmax Plasma
- DuPont
- ECT2 (Montrose Environmental Group)
- Element Six
- EPOC Enviro
- Evoqua Water Technologies
- Framergy
- General Atomics
- Gradiant
- Greenlab
- Haycarb
- InEnTec
- Inhance Technologies
- Jacobi Group
- Kuraray
- Lanxess AG
- Memsys Water Technologies GmbH
- Myconaut
- Onvector
- OXbyEL Technologies
- Ovivo
- Oxyle AG
- Perma-Fix Environmental Services, Inc.
- PyroGenesis
- Regenesis
- RemBind
- RemWell
- ResinTech
- Revive Environmental
- Thermax
- Veolia
- Xylem Inc
- ZeoTech