Kan. Stat. § 13-1209
Any city of the first class in the state of Kansas shall have full power and authority to purchase, construct or extend waterworks for the purpose of supplying such city and its inhabitants with water, and may maintain, operate and regulate the same, and prescribe the rates at which water shall be furnished; and any such city may acquire, by purchase or appropriate proceedings in condemnation, all grounds deemed necessary either within or without the city upon which to erect such works, and upon which to lay pipes and mains for the purpose of conveying water to consumers; and for the purpose of protecting, maintaining and operating such works, any such city shall have the same jurisdiction over any grounds acquired outside of the city for such purposes, as if such grounds were within the city.
K.S.A. 13-1209