Zumach was born on a farm in Black Creek, Wisconsin but moved with his parents to Milwaukee three years later and attended Milwaukee Public Schools.
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Zumach was elected to the Senate for the 6th District (6th, 7th, 9th and 10th wards of the City of Milwaukee) in 1916 to succeed Democrat George Weissleder (who was not a candidate for re-election), receiving 4,147 votes to 4,006 for Republican Charles Meising, 1,744 for Democrat Charles Jungmann, and 73 for Prohibitionist Henry W. Schmidt.