Hereunder is the present list of fifty six (56) institutional members, grouped according to sector:
National Government Agencies (NGAs) – 8 members
- Department of Agriculture (DA) / Bureau of Soil and Water Management (BSWM)
- Department of Environment and Natural Resources (DENR) / River Basin Control Office (RBCO)
- DPWH-PMO Flood Control Management Cluster
- Forest Management Bureau (FMB)
- National Water Resources Board (NWRB)
- Biodiversity Management Bureau (BMB)
- Water Supply and Sanitation PMO, Department of the Interior and Local Government (DILG)
- National Commission on Indigenous Peoples (NCIP)
Government Owned and Controlled Corporations (GOCCs ) – 4 members
- Laguna Lake Development Authority (LLDA)
- Local Water Utilities Administration (LWUA)
- Metropolitan Waterworks and Sewerage System (MWSS)
- National Irrigation Administration (NIA)
Water Districts (WDs) – 11 members
- Angeles City Water District
- Bacolod Water District
- Baguio City Water District
- Batangas City Water District
- Cagayan de Oro City Water District
- Calamba City Water District
- Dasmariñas Water District
- Davao City Water District
- Metro Cebu Water District
- Metro Kidapawan Water District
- San Pedro Water District
Local Government Units (LGUs) – 5 members
- League of Municipalities of the Philippines (LMP)
- League of Cities of the Philippines (LCP)
- League of Provinces of the Philippines (LPP)
- City Environment and Natural Resources Office – Pasig City
- Union of Local Authority of the Philippines (ULAP)
Non-Government Organizations (NGOs) – 6 members
- Cebu Uniting for Sustainable Water Foundation, Inc.
- PLAN International / PLAN Philippines
- Philippine Association of Water Districts (PAWD)
- Society for the Conservation of Philippine Wetlands, Inc.
- National Water and Sanitation Association of the Philippines (NAWASA)
- The Grassroots Democracy Institute and Resource Center (GDIRC)
Academe & Research Institutions – 5 members
- Ateneo Research Network for Development, Ateneo de Manila University
- Manila Observatory
- National Hydraulic Research Center (NHRC), University of the Philippines-Diliman
- Institute of Civil Engineering, University of the Philippines-Diliman
- University of San Carlos – Water Resources Center (USC-WRC)
Private Sector (Consulting Firms, Metro Manila concessionaires including other private
water service providers, associations, cooperatives) – 17 members
- Manila Water Company, Inc.
- Maynilad Water Services, Inc.
- CEST Inc.
- TCGI Engineers Inc.
- DCCD Engineering Corporation
- Engineering and Development Corporation of the Philippines (EDCOP)
- Urban Integrated Consultants, Inc. / Urban Engineers
- Tubig Pilipinas
Small Water Service Providers / Water Cooperatives
- Inpart Waterworks and Development Company (IWADCO)
- Central Water Systems, Inc. / Primewater Corporation
- Darasa Rural Waterworks and Sanitation Association
- Iligan City Waterworks System
- Sto. Tomas Waterworks System
- Padada Water System Cooperative
- Maragusan Waterworks and Sanitation Multi-Purpose Cooperative
- San Jose Water Service Development Cooperative
- Pantok Multi-Purpose Cooperative