Regular Season Champion

1915-16 California, Oregon St.
1916 Washington St.
1917 ---
1918 Oregon
1919 Stanford
1920 Stanford
1921 Idaho
1922 Idaho
1923 California
1924 California
1925 California
1926 California
1927 Southern Cal
1928 California
1929 Southern Cal
1930 Washington
1931 California
1932 Oregon St.
1933 Washington
1934 Southern Cal
1935 Stanford
1936 Stanford
1937 Stanford
1938 Oregon
1939 Southern Cal
1940 Washington St.
1941 Stanford
1942 Washington
1943 N: Washington 
     S: California
1944 N: Oregon
     S: UCLA
1945 California
1946 Oregon St.
1947 Washington
1948 Oregon St.
1949 UCLA
1950 Washington
1951 UCLA
1952 Washington
1953 Southern Cal
1954 Oregon St.
1955 UCLA
1956 California
1957 Oregon St., California
1958 California
1959 California
1960 Southern Cal
1961 UCLA
1962 UCLA, Stanford
1963 UCLA
1964 UCLA
1965 Oregon St.
1966 UCLA
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 Oregon St.
1980 Oregon St.
1981 Oregon St.
1982 UCLA
1983 Washington, Oregon St.
1984 Washington, Southern Cal
1985 Arizona
1986 UCLA
1987 Arizona
1988 Arizona
1989 Oregon St., Arizona
1990 Arizona
1991 UCLA
1992 Arizona
1993 Arizona
1994 UCLA
1995 UCLA
1996 UCLA
1997 Arizona
1998 Stanford
1999 Arizona, Stanford
2000 Stanford
2001 Oregon
2002 Arizona
2003 Stanford
2004 Arizona
2005 UCLA
2006 UCLA
2007 UCLA
2008 Washington

Conference Tournament Champion

1986 UCLA
1987 Arizona
1988 Arizona
1989 Arizona
1990 ---
1991 ---
1992 ---
1993 ---
1994 ---
1995 ---
1996 ---
1997 ---
1998 ---
1999 ---
2000 ---
2001 Arizona
2002 Oregon
2003 Stanford
2004 Washington
2005 UCLA
2006 Oregon
2007 UCLA
2008 USC