This bill amends Chapter 18, Title 42 of the Idaho Code by adding a new section, 42-1807, which establishes regulations regarding the distribution of water between districts. It prohibits the director from curtailing surface water usage in one district to satisfy water rights claims in another district unless the affected surface water users have the ability to seek relief within their own district. This relief includes the appropriation of surface water, groundwater, springs, and any other water sources managed by the state of Idaho.

Additionally, the bill stipulates that once both surface and groundwater districts within a tributary district are fully operational and administered by the department, the priority doctrine of "first in time, first in right" and the conjunctive management rules will apply to all water sources. The bill declares an emergency, making it effective on July 1, 2025.