Su Watergas sono presenti 357 associazioni internazionali.

ALUSEAU a.s.b.l.

ASSOCIATION LUXEMBOURGEOISE DES EAU

338 Rue de Rollingergrund
Luxembourg (Luxembourg)

AMGN

ASOCIACION MEXICANA DE GAS NATURAL A.C.

Av. Ejército Nacional Mexicano #826-A - Primer piso Depto. 103 Col. Polanco
CP 11550 Mexico City (Mexico)

AMPP

Association for Materials Protection and Performance

c/o St John's Innovation Centre
Cowley Road
Cambridge CB4 0WS (United Kingdom)

AMTA

AMERICAN MEMBRANE TECHNOLOGY ASSOCIATION

PO Box 14918 Tallahassee FL 32317 US
2409 SE Dixie Highway
Stuart FL 34996 (United States)

AMWA

ASSOCIATION OF METROPOLITAN WATER AGENCIES

1620 Street NW - Suite 500
Washington DC 20006 (United States)

ARA (IWA ROMANIA)

ROMANIAN WATER ASSOCIATION

Splaiul Independentei 202H
Bucarest 6 (Romania)