Tseng is not only a member of the Heartland Hakka Association and the Hsinchu Hometown Association, he is also a founding member of the Self-Reliance Society, and the Kuanhsi Hometown Association.
曾于洋洋不僅參加中原客家會、新竹旅北同鄉會，同時也是自強會和關西旅北同鄉會的發起人之一。