Wondolowski's tally came in the 73rd minute off a diving header from within the Galaxy box following a Marvin Chavez corner kick and erased a 2-1 San Jose deficit.
The Earthquakes striker now needs two markers in next weekend's season-ending contest at Portland to best the current mark of 27 goals, set by Tampa Bay's Roy Lassiter in 1996.
Chavez also scored for San Jose (19-6-8), which Saturday clinched the league's best overall record when Sporting Kansas City played to a draw against New York.
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