Regular Season Champion

1916 California, Oregon St.
1917 Washington St.
1918 ---
1919 Oregon
1920 Stanford
1921 Stanford
1922 Idaho
1923 Idaho
1924 California
1925 California
1926 California
1927 California
1928 Southern Cal
1929 California
1930 Southern Cal
1931 Washington
1932 California
1933 Oregon St.
1934 Washington
1935 Southern Cal
1936 Stanford
1937 Stanford
1938 Stanford
1939 Oregon
1940 Southern Cal
1941 Washington St.
1942 Stanford
1943 Washington
1944 N: Washington 
     S: California
1945 N: Oregon
     S: UCLA
1946 California
1947 Oregon St.
1948 Washington
1949 Oregon St.
1950 UCLA
1951 Washington
1952 UCLA
1953 Washington
1954 Southern Cal
1955 Oregon St.
1956 UCLA
1957 California
1958 Oregon St., California
1959 California
1960 California
1961 Southern Cal
1962 UCLA
1963 UCLA, Stanford
1964 UCLA
1965 UCLA
1966 Oregon St.
1967 UCLA
1968 UCLA
1969 UCLA
1970 UCLA
1971 UCLA
1972 UCLA
1973 UCLA
1974 UCLA
1975 UCLA
1976 UCLA
1977 UCLA
1978 UCLA
1979 UCLA
1980 Oregon St.
1981 Oregon St.
1982 Oregon St.
1983 UCLA
1984 Washington, Oregon St.
1985 Washington, Southern Cal
1986 Arizona
1987 UCLA
1988 Arizona
1989 Arizona
1990 Oregon St., Arizona
1991 Arizona
1992 UCLA
1993 Arizona
1994 Arizona
1995 UCLA
1996 UCLA
1997 UCLA
1998 Arizona
1999 Stanford
2000 Arizona, Stanford
2001 Stanford
2002 Oregon
2003 Arizona
2004 Stanford
2005 Arizona
2006 UCLA
2007 UCLA
2008 UCLA

Conference Tournament Champion

1987 UCLA
1988 Arizona
1989 Arizona
1990 Arizona
1991 ---
1992 ---
1993 ---
1994 ---
1995 ---
1996 ---
1997 ---
1998 ---
1999 ---
2000 ---
2001 ---
2002 Arizona
2003 Oregon
2004 Stanford
2005 Washington
2006 UCLA
2007 Oregon
2008 UCLA