The District makes supplemental water available to the people and land within its boundaries. General District and Improvement District annexation proposals are evaluated and, as a condition of eligibility for supplemental (Metropolitan Water District) water, charges are assessed at the time property is to be annexed. All charges due, method of payment, necessary water facilities, and other applicable requirements, terms, and, conditions pertaining to the annexation are determined, defined, and set forth in proceedings by the District, Metropolitan Water District, in accordance with State law and District rules and regulations. Detachments from the General District or an Improvement District are subject to the above described proceedings.