Nothing in this subtitle shall be construed to alter, change, modify, or restrict the zoning or land use planning authority of any subdivision, municipality, or public instrumentality. The Authority shall not be deemed to be a public service company within the meaning of the Public Utilities Article, and the jurisdiction and powers of the Public Service Commission shall not extend to the Authority. Unless otherwise expressly prohibited by any contractual agreement, a subdivision may enter into a contract with the Maryland Environmental Service relating to the provision by the Maryland Environmental Service of any project.