Joseph McKenna, Los Angeles v. Los Angeles City Water Company…
“ It is not denied that the city had power to regulate rates. Indeed, it is insisted that it was so constantly its duty that it could not be contracted away. It was not a power, therefore, necessary to be granted by the contract, and the distinction between the proprietary right and the municipal right, made by appellants, would have been idle to observe. To have limited the right of regulation to the city in one capacity, and left it unrestrained in the other, would have been useless, and such intention cannot be attributed to the parties. ”
