At February 2011 the FMA had a membership of 93 organisations.

Membership of the FMA is in several grades:

• Full Membership …. Local Councils, Catchment Management Authorities, County Councils and other organisations as may be approved from time to time under the constitution.
• Associate Membership  …. Interstate authorities, catchment management authorities and other approved organisations. 
• Corporate Membership....Consultants, businesses, government departments and educational institutions.
• Individual Membership …. Private persons
•  Life Membership ….  Life Membership is awarded to individuals in recognition of outstanding and meritorious service over a period of time. Former Chairmen the late Harold Sternbeck and Clr Allan Ezzy are the only members to have this honour conferred.

Application for membership should be made in writing to the Executive Officer.