He was adopted by his relative Tadachika MIZUNO (received a stipend of 2,300 koku), a direct vassal of the shogun, on August 10, 1674, and took over as the head of the family.
延宝2年（1674年）7月9日に親族の旗本水野忠近（2300石）の養子となって家督を継いだ。