The origin ofwaterright of a waterresources scheme isto collectwaterresources fee and the water right of a water supply scheme is to turn watercharges collection into water pricing.
They include water supply and sewerage, including abstraction and impounding of water, resources management, water quality, the water industry, watercharges, safety of reservoirs and so on.
Simply, because under the Constitution, state governments have authority over waterresources -- and they are loath to give it up to the feds because they earn billions from watercharges.