Water Utilities Trade Associations

American Membrane Technology Association (AMTA)

U.S.-based trade association advancing membrane technologies for drinking water, wastewater, and reuse through training, advocacy, and the AWWA/AMTA Membrane Technology Conference. Membership is about 820 organizations and individuals.

https://www.amtaorg.com/ Membership: 820

American Water Works Association (AWWA)

The largest organization of water supply professionals worldwide, providing standards, training, research, and advocacy; its 50,000 members include 4,300+ utilities supplying roughly 80% of North America’s drinking water.

https://www.awwa.org/ Membership: 50,000

Association of California Water Agencies (ACWA)

The largest statewide coalition of public water agencies in the U.S., representing approximately 470 California public agencies that deliver about 90% of the state’s water; focuses on policy, advocacy, and member services.

https://www.acwa.com/ Membership: 470

Association of Clean Water Administrators (ACWA)

National association of state, interstate, and territorial clean water program leaders responsible for surface water protection; current roster includes the 50 states plus DC, six interstate commissions, and affiliates.

https://www.acwa-us.org/ Membership: 59

Association of State Drinking Water Administrators (ASDWA)

Professional association for state drinking water programs; members are the administrators for the 50 states, 5 territories, the Navajo Nation, and DC (57 total), supporting implementation of the Safe Drinking Water Act.

https://www.asdwa.org/ Membership: 57

European Water Association (EWA)

European umbrella association bringing together 22 national water organizations plus corporate and research members; represents about 50,000–55,000 professionals across the water and environmental management field.

https://www.ewa-online.eu/ Membership: 22

International Desalination & Reuse Association (IDRA)

Global nonprofit for desalination and water reuse, connecting utilities, technologists, and researchers; serves about 2,600 core members in 60 countries, with thousands more affiliate participants.

https://idrawater.org/ Membership: 2,600

International Water Association (IWA)

Worldwide network of water professionals and utilities (10,000+ members across 140+ countries) advancing knowledge, standards, and innovation; convenes the IWA World Water Congress & Exhibition.

https://www.iwa-network.org/ Membership: 10,000

National Association of Clean Water Agencies (NACWA)

Advocacy association for publicly owned wastewater and stormwater utilities nationwide; represents 300+ public clean water agencies and provides policy, legal, and regulatory leadership for the sector.

https://www.nacwa.org/ Membership: 300

National Association of Water Companies (NAWC)

Trade association for investor‑owned/regulated water and wastewater companies; membership spans large multistate firms to local systems, serving nearly 40 million Americans. Recent public listings show at least 26 named member companies.

https://nawc.org/ Membership: 26

National Ground Water Association (NGWA)

Nonprofit for U.S. and international groundwater professionals (contractors, scientists/engineers, manufacturers, suppliers), advancing responsible groundwater development; membership is nearly 10,200.

https://www.ngwa.org/ Membership: 10,200

National Rural Water Association (NRWA)

America’s largest water and wastewater utility membership organization, uniting state rural water associations and representing more than 31,000 small and rural utility members with training and on‑site technical assistance.

https://nrwa.org/ Membership: 31,000

Smart Water Networks Forum (SWAN)

Global nonprofit forum accelerating adoption of data‑driven, “smart water” solutions; supports utilities and suppliers through working groups, tools, and events, with 350+ member organizations in 45+ countries.

https://swan-forum.com/ Membership: 350

U.S. Water Alliance

National nonprofit advancing the One Water approach through policy, research, and convenings; has 200+ cross‑sector members (utilities, companies, NGOs, academia), with member utilities serving 100M+ people.

https://uswateralliance.org/ Membership: 200

Water and Wastewater Equipment Manufacturers Association (WWEMA)

Trade association of water and wastewater technology manufacturers and service providers (nearly 100 member companies), advocating on procurement, trade, funding, and innovation with federal and industry partners.

https://wwema.org/ Membership: 100

Water Environment Federation (WEF)

Not‑for‑profit technical and educational organization for water quality professionals, with more than 30,000 individual members and 75 affiliated Member Associations worldwide.

https://www.wef.org/ Membership: 30,000

Water Services Association of Australia (WSAA)

Peak industry body for water utilities in Australia and Aotearoa New Zealand, representing around 100 water businesses and providing services to utilities that serve 24+ million customers.

https://www.wsaa.asn.au/ Membership: 100

Water UK

UK trade association representing the nation’s water and wastewater companies; has 25 full members (plus associate members) and engages government and regulators on industry policy and performance.

https://www.water.org.uk/ Membership: 25

WaterISAC

The Water Information Sharing and Analysis Center for the sector, providing all‑hazards threat intelligence, cybersecurity alerts, and resilience resources; surpassed 600 member organizations in 2024.

https://www.waterisac.org/ Membership: 600

WateReuse Association

The only national trade association solely focused on advancing laws, policy, funding, and public acceptance for water recycling; has 500+ organizational members, including 200+ utilities representing 60M+ Americans.

https://watereuse.org/ Membership: 500