The original Victorian wastewater operators Association was founded in 1973. The role of the Association has expanded over the years and now provides services to staff employed in all facets of the water industry.
The Association now organises the Annual Victorian Water Industry Engineers and Operators Conference, an event that has been staged annually for over 70 years. From 2006, WIOA took over the annual organisation of the “Operations” based Workshop in Queensland and from 2007 has provided a similar event in NSW.
WIOA Executive
| Year | President | Secretary/Treasurer | Life Members |
| 2019 | H. Josipovic | G. Wall | |
| 2018 | A. Rijnbeek | G.Wall | J. Harris |
| 2017 | A. Rijnbeek | G.Wall | P. Tolsher |
| 2016 | R.McGowan | G.Wall | |
| 2015 | R.McGowan | G.Wall | |
| 2014 | R.Mack | G.Wall | R. Mack |
| 2013 | R.Mack | G.Wall | |
| 2012 | J. Day | G.Wall | |
| 2011 | J. Day | G.Wall | |
| 2010 | A.Evans | G.Wall | |
| 2009 | A.Evans | G.Wall | |
| 2008 | P.Tolsher | G.Wall | |
| 2007 | P.Tolsher | G.Wall | B.Waddell |
| 2006 | C.Lim | G.Wall | |
| 2005 | C.Lim | G.Wall | |
| 2004 | J.Harris | G.Wall | G.Wall |
| 2003 | J.Harris | G.Wall | |
| 2002 | R.Mack | G.Wall | |
| 2001 | R.Mack | G.Wall |
AWWOA Executive
| Year | President | Secretary/Treasurer | Life Members |
| 2000-01 | B.Waddell | G.Wall | |
| 1999-00 | B.Waddell | G.Wall | |
| 1998-99 | R.Greenhough | G.Wall | R.Bergmeier |
| 1997-98 | R.Greenhough | G.Wall | |
| 1996-97 | L.Strange | G.Wall | |
| 1995-96 | L.Strange | G.Wall | |
| 1994-95 | L.Smith | C.Sandeman | S.Franzi |
| 1993-94 | L.Smith | C.Sandeman | |
| 1992-93 | L.Smith | C.Sandeman | |
| 1991-92 | W.Murdoch | J.Anderson/C.Sandeman | |
| 1990-91 | W.Murdoch | J.Anderson | |
| 1989-90 | I.Ruscoe | W.Murdoch | |
| 1988-89 | I.Ruscoe | J.Anderson | |
| 1987-88 | J.Anderson | S.Lefebrve | |
| 1986-87 | C.Sandeman | S.Lefebrve | R.Holloway + |
| 1985-86 | L.Morris | N.Dinger | |
| 1984-85 | C.D’Herville | N.Dinger | |
| 1983-84 | R.Holloway | V.Jones | |
| 1982-83 | R.Holloway | V.Jones | |
| 1981-82 | R.Holloway | V.Jones | |
| 1980-81 | R.Holloway | V.Jones | |
| 1979-80 | R.Holloway | V.Jones | |
| 1978-79 | R.Holloway | V.Jones | |
| 1977-78 | R.Holloway | V.Jones | |
| 1976-77 | R.Holloway | V.Jones | |
| 1975-76 | R.Holloway | V.Jones | |
| 1975-76 | R.Holloway | V.Jones | |
| 1974-75 | R.Holloway | V.Jones | |
| 1973-74 | R.Holloway | V.Jones | |
| 1972-73 | R.Holloway | V.Jones |
+ Deceased