Dayne Jackson scored the Yellow Jackets three goals. Dustin Quinn and Cody Boulware each had an assist.
Union County goalie Robert Humphries has 12 saves.
The Yellow Jackets (3-4 overall, 1-1 region) will next host Clinton 5 p.m. Wednesday.
Union County’s junior varsity team also beat Chapman 2-1 on Monday.
Roberto Cajamarca and Michael Cunningham each scored a goal for the JV Jackets.