Ohio Rev. Code Ann. § 743.14

All ordinances, except those relative to taxation or assessment, resolutions, rules, and regulations relative to the construction, maintenance, and operation of water works, mains, hydrants, and service pipes and connections, and the protection thereof, shall operate in a similar manner in the territory outside the municipal corporation when the extensions mentioned in sections 743.12 and 743.13 of the Revised Code have been made, and for the enforcement thereof the jurisdiction of the mayor and police shall extend into and over such territory.