Mich. Comp. Laws § 123.143

Sec. 3. Where water is sold to purchasers other than cities and villages in such outside territory, such corporations shall exercise all the powers and have all the rights and remedies in connection with such water system in such outside territory, the sale, and delivery of water therefrom, the fixing of water rates and the collection thereof, and all other matters incident to its operation which they possess by law within their own territorial limits.