Sacramento Central Groundwater Authority (SCGA) serves as the Plan Manager and Fiscal Agent for the South American Subbasin (SASb).

As the largest GSA in the basin, SCGA provides leadership and coordination to support basin‑wide GSP implementation. Responsibilities include:

• Coordinating basin‑wide groundwater sustainability activities 
• Administering shared program funding and fiscal management 
• Supporting preparation of SGMA‑required annual reports 
• Coordinating five‑year GSP periodic evaluations 
• Facilitating communication among GSAs, technical teams, and stakeholders 

SCGA works closely with partner agencies and technical consultants to ensure the basin continues to meet SGMA requirements and maintain long‑term groundwater sustainability.