1981 Austin, Cindy Newman
1982 Edinburg, Bill Mead
Class I - Plant of the Year
1983 Waldron
1984 ?
1985 ?
1986 Waldron, Ron Fuchs
1987 Waldron, Ron Fuchs
1988 Sunman WWTP
1989 ?
1990 Whiteland WWTP, Dean Lewis
1991 Trafalgar
1992 No nominations
1993 No Award
1994 No Award
1995 No Award
1996 Jackson CSD, Dan Robertson
1997 ?
1998 ?
1999 ?
2000 A combined Class I/II given
2001 A combined Class I/II given
2002 Jackson CSD, Dan Robertson
2003 No Award
2004 No Award
2005 No Award
2006 No Award
2007 No Award
1983 Waldron, Ron Fuchs
1984 ?
1985 ?
1986 Whiteland, Dean Lewis
1987 Whiteland, Dean Lewis
1988 Brownstown WWTP
1989 ?
1990 Whiteland, Dean Lewis
1991 Nashville
1992 Western Wayne RSD
1993 Whiteland
1994 No Award
1995 Sunman WWTP
1996 Charlestown WWTP
1997 Brownstown, Scott Hunsucker
1998 ?
1999 No Award
2000 A combined class I/II given
2001 A combined class I/II given
2002 Brownstown, Scott Hunsucker
2003 South Henry RSD, Jerry Libby
2004 Florence, Shannon Jackson
2005 Brownstown, Scott Hunsucker
2006 Osgood, Tony Wood
2007 South Henry RSD, Jerry Libby
2000 Whiteland, Chris Shank
2001 Florence RSD, Shannon & Larry Stewart
1983 Bloomington
1984 ?
1985 ?
1986 Bloomington/ Blucher Poole
1987 WM Edwin Ross Plant/Richmond
1988 North Vernon
1989 ?
1990 Columbus, Max Dyer
1991 Franklin, Rick Littleton
1992 Scottsburg
1993 Connersville
1994 Greensburg
1995 Bloomington
1996 Jeffersonville, Kendall Coleman
1997 Franklin, Rick Littleton
1998 North Vernon
1999 Clarksville
2000 Ellettsville, Jeff Farmer
2001 Batesville, Randy Gibbs
2002 Scottsburg, Chris Mills
2003 Greencastle, Mike Neese
2004 North Vernon
2005 Greensburg, Jeff Smith
2006 Edinburg, Glenn Giles
2007 North Vernon, Dave McCorvie
Class IV - Plant of the Year
2000 Connersville, Bill Ammerman
2001 Columbus, Randy Duckworth
2002 Connersville, Bill Ammerman
2003 Shelbyville, Bradley E. Fix
2004 Bloomington, Dillman Rd.
2005 Shelbyville, Bradley E. Fix
2006 Batesville, Randy Gibbs
2007 Shelbyville, Bradley E. Fix