- Drinking Water Inspectorate - regulating public water supply
- Ech2o - sustainable water consultants
- Elemental Solutions - design for sustainable water management
- Envirolet - compost toilets
- Humanure Handbook - design & build compost toilets
- Oasis Design - grey water information & systems
- Rain harvesting systems - suppliers of rainwater goods
- Waterwise - dedicated to decreasing water consumption
- Water Works - water & sewage treatment in Wales
- WRAS - Water Regulatory Advisory Scheme