Ohio Rev. Code Ann. § 743.13

When any person at his own expense has laid down and extended mains and water pipes or electric light and power lines beyond the limits of a municipal corporation, and the legislative authority thereof, by resolution, has authorized the proper officer of the water works to superintend or supervise such laying and extension, the municipal corporation shall furnish water or electricity to the residents and property holders on the line of such facilities. The same rules and regulations which govern the furnishing of water or electricity to its own citizens shall apply in such cases, except that the rates charged therefor shall not exceed those within the municipal corporation by more than one tenth.