Electric, Water, Gas and Sewer Services Trade Associations

American Gas Association

Represents more than 200 local energy companies that deliver natural gas across the U.S.; leads advocacy, safety, and industry programs for gas utilities.

https://www.aga.org/ Membership: 200

American Public Gas Association

Not‑for‑profit national association for public and community‑owned natural gas utilities; 730+ utility members in 38 states; advocacy, best‑practice sharing, and training.

https://www.apga.org/ Membership: 730

American Public Power Association

The voice of not‑for‑profit, community‑owned electric utilities; about 1,400 public power utility members; federal advocacy, education, and technical programs.

https://www.publicpower.org/ Membership: 1,400

American Water Works Association

Largest organization of water supply professionals worldwide; 50,000 members and 4,300+ utilities supplying roughly 80% of North America’s drinking water; standards, training, and conferences.

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

Association of Edison Illuminating Companies

Electric utility operations leaders’ association where 185 member companies collaborate to share knowledge and guidance on generation, transmission, distribution, and storage.

https://www.aeic.org/ Membership: 185

Edison Electric Institute

Represents all U.S. investor‑owned electric companies; also 70+ international electric company members and hundreds of associate members; provides policy leadership and forums. See EEI’s published member list (Mar 2025).

https://www.eei.org/ Membership: 60

International District Energy Association

Global district energy association for district heating, cooling, and CHP systems; 450+ member organizations and nearly 3,000 individual members; education, networking, and advocacy.

https://www.districtenergy.org/ Membership: 450

Interstate Natural Gas Association of America

Trade organization for interstate natural gas transmission; 27 member companies operating nearly 200,000 miles of pipeline; advocates on regulatory, safety, and infrastructure issues.

https://ingaa.org/ Membership: 27

Large Public Power Council

Coalition of the 29 largest U.S. public power systems serving about 30.5 million consumers; advances federal policy enabling affordable, reliable public power.

https://www.lppc.org/ Membership: 29

National Association of Clean Water Agencies

National voice of publicly owned clean water (wastewater and stormwater) utilities; 300+ public agencies and affiliates; legislative, regulatory, and legal advocacy.

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

National Association of Sewer Service Companies (NASSCO)

Sets standards and provides training for assessment, maintenance, and rehabilitation of underground infrastructure; nearly 700 organizational members (contractors, suppliers, utilities, agencies).

https://nassco.org/ Membership: 700

National Rural Electric Cooperative Association

Represents nearly 900 consumer‑owned electric cooperatives (832 distribution and 64 G&T) serving 42 million people; advocacy, benefits, training, and research.

https://www.electric.coop/ Membership: 900

National Rural Water Association

Federation of state rural water associations representing 26,696 water and utility members; delivers training and technical assistance for small and rural systems.

https://nrwa.org/ Membership: 26,696

Smart Electric Power Alliance

Nonprofit that convenes utilities, regulators, and technology providers to accelerate a clean, affordable, resilient electricity system; 1,000+ member organizations.

https://sepapower.org/ Membership: 1,000

Southern Gas Association

Trade association for the natural gas sector with 500+ member organizations (about 200 operators and 300+ industry partners); delivers training, peer collaboration, and joint projects.

https://southerngas.org/ Membership: 500

Utilities Technology Council

Global trade association for utility telecommunications and networking; almost 400 member utilities (plus vendors); advocacy, education, and regional member communities.

https://utc.org/ Membership: 400

Water Environment Federation

Technical and educational federation of water quality professionals with 30,000+ individual members and 75 Member Associations; hosts WEFTEC and provides training and standards.

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

Water Quality Association

Association for residential, commercial, and industrial water treatment; more than 2,500 member companies; certification, standards, and education programs.

https://wqa.org/ Membership: 2,500

WaterISAC

The water sector’s Information Sharing and Analysis Center; surpassed 600 member organizations (about 70% utilities) serving an estimated 231 million Americans; provides all‑hazards threat alerts and analysis.

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

WateReuse Association

Only national trade association dedicated solely to advancing policies and funding for water recycling; membership represents 200+ communities serving 60+ million people.

https://watereuse.org/ Membership: 200