S.B. No. 1583 amends the Water Code to enhance the management plans adopted by groundwater conservation districts. The bill introduces new requirements for these plans, mandating that they be developed using the district's best available data and submitted to the regional water planning group. Specifically, the management plans must include the most recently approved desired future conditions and the corresponding amount of modeled available groundwater. Additionally, districts are required to amend their management plans within two years of adopting desired future conditions. If a petition challenging the reasonableness of a desired future condition is filed, the management plan can still be considered administratively complete if it includes certain specified information.

The bill also modifies the approval process for management plans by the executive administrator, who must approve a plan within 60 days if it is administratively complete. The definition of "administratively complete" is expanded to include compliance with the new requirements outlined in the bill. Furthermore, the changes made by this Act will only apply to petitions filed after its effective date of September 1, 2025, ensuring that any petitions filed prior will be governed by the previous law.

Statutes affected:
Introduced: Water Code 36.1071, Water Code 36.108 (Water Code 36)
Senate Committee Report: Water Code 36.1071, Water Code 36.108 (Water Code 36)
Engrossed: Water Code 36.1071, Water Code 36.108 (Water Code 36)
House Committee Report: Water Code 36.1071, Water Code 36.108 (Water Code 36)
Enrolled: Water Code 36.1071, Water Code 36.108 (Water Code 36)