Suetada extended his influence by insinuating himself into powerful families such as Sekkan-ke (the families which produced regents), Insei (government by cloistered emperors) circles, and Kawachi-Genji clan, and succeeded in establishing the power base of the Mizuhai clan.
摂関家や院政、河内源氏などに巧みに接近して、その勢力を拡大し、水走氏の勢力基盤を築くことに成功した。