Su Watergas sono presenti 357 associazioni internazionali.

ASDWA

ASSOCIATION OF STATE DRINKING WATER ADMINISTRATORS

1401 Wilson Boulevard
Arlington VA 22209 (United States)

ASEAN

ASSOCIATION OF SOUTHEAST ASIAN NATIONS

Sisingamangaraja No.70A, Kebayoran Baru
Jakarta (Indonesia)

ASPE

AMERICAN SOCIETY OF PLUMBING ENGINEERS

6400 Shafer Ct., Suite 350
60018-4914 Rosemont IL (United States)

ASSE

AMERICAN SOCIETY OF SANITARY ENGINEERING

18927 Hickory Creek Drive, Suite 220
Mokena IL 60448 (United States)

Associazione europea del Biogas

Rue d'Arlon 63-67, B
Bruxelles (Belgium)