Mich. Comp. Laws § 280.25

Sec. 25. The commissioner and his bondsmen shall be liable for all the acts and defaults of the deputy or deputies when appointed as herein provided. After entry of the order designating drainage districts as provided in section 54 and section 105 of this act, the drainage district as designated shall be responsible for and liable for all acts and defaults of such commissioner and his deputy or deputies, except for acts of malfeasance or misfeasance. The board of supervisors may adopt resolutions providing that public liability or other insurance may be purchased at the expense of the county to cover such potential liabilities of the various drainage districts under the supervision of the county drain commissioner.