Agreements are made by public water suppliers and tribes. Counties can participate. Agreements are approved by the Department of Ecology, following public comment and consultation with the departments of Health, Community, Trade, and Economic Development, Fish and Wildlife, local government and tribes. Agreements cover streamflows, conservation, reclaimed water, and interties. Agreements are consistent with land use and water supply planning.
Ecology approves changes to water rights according to combined service areas.
Public utility districts can become regional water supply utilities, which are formed and approved similarly to regional integrated water supply management agreements. Ecology approves changes to water rights of public water systems included in a regional water supply utility, subject to consistency with water supply plans, conservation, and instream flows.