| Name | Type | Country / Region Presence |
| Agua es Nuestro Derecho | Grassroots campaign (Spanish only) | Latin America (likely Peru/Ecuador) |
| AIDA – Interamerican Association for Environmental Defense | NGO | Offices in Mexico, Costa Rica, Colombia; Latin America focus |
| American Rivers | NGO | US-based; HQ Washington DC; nationwide work |
| Aryavart Foundation | NGO | India (Gujarat); litigation on industrial river pollution (Sabarmati) |
| CAFF | NGO/Legal Charity | UK |
| CIEL – Center for International Environmental Law | NGO / Legal Charity | HQ Washington DC & Geneva; global |
| ClientEarth | Legal Charity | HQ London; offices in Brussels, Warsaw, Berlin, Madrid, Beijing, LA |
| EarthRights International (ERI) | NGO | HQ Washington DC; offices in Peru & Thailand; global cases |
| ELAW – Environmental Law Alliance Worldwide | NGO / legal network | HQ Oregon, USA; partners in 80+ countries |
| Environmental Law Foundation (ELF) | Legal charity | UK-based |
| Fish Legal | Legal charity / NGO | UK-based |
| Goa Foundation | NGO | India (Goa); PILs incl. water/industrial pollution |
| Greenpeace International | NGO | HQ Amsterdam; offices in 55+ countries worldwide |
| International Rivers | NGO | HQ Oakland, CA; offices/partners in Brazil, India, Thailand, DRC |
| La Red Vida, Derecho al Agua | NGO Coalition | Latin America |
| Leigh Day | Law firm | UK (London, Manchester); global litigation (esp. extractives, pollution) |
| MODATIMA | NGO | Chile |
| Namati | NGO | HQ Washington DC; programmes in India, Kenya, Sierra Leone, Mozambique, Myanmar, US |
| Natural Justice – Lawyers for Communities and the Environment | NGO / Legal Charity | Africa (South Africa, Kenya, Senegal); regional legal empowerment |
| OHCHR – Office of the High Commissioner for Human Rights | UN body | HQ Geneva; field presences worldwide |
| People’s Science Institute | NGO | India (Dehradun, Uttarakhand); water quality, river ecology |
| Ríos Vivos Colombia | NGO / grassroots movement | Colombia (Ituango dam, Antioquia); links to intl. networks |
| Save Our Rivers UK | NGO / campaign | UK |
| Sierra Club | NGO | US-based; nationwide chapters |
| Vanashakti | NGO | India (Mumbai / Maharashtra); PILs for rivers & wetlands |
| Vindhyan Ecology & Natural History Foundation (Vindhya Bachao) | NGO | India (Uttar Pradesh, Vindhya region) |
| WASP – Windrush Against Sewage Pollution | Grassroots NGO / campaign | UK (Thames/Severn catchments) |
| Wildjustice | NGO | UK |