Groundwater Sustainability Plan

Under the Sustainable Groundwater Management Act (SGMA), one of the key responsibilities of the Santa Margarita Groundwater Agency (SGMWA) is developing, adopting, and submitting a Groundwater Sustainability Plan (GSP) for the Santa Margarita Groundwater Basin (Basin). The Basin forms a roughly triangular area between Felton, Ben Lomond and Scotts Valley. The Basin provides drinking water for the Scotts Valley and San Lorenzo Valley Water Districts, over a dozen small water systems and around 1100 parcels served by private wells. Additionally, the groundwater table influences the surface water in the San Lorenzo River, a primary drinking water source for the city of Santa Cruz and a home to endangered species.  

The Basin’s GSP is due to the California Department of Water Resources (DWR) by January 31, 2022.

The 60-day public comment period for the Groundwater Sustainability Plan (GSP) closed on Thursday, September 23. The final GSP was adopted  by the Board of Directors on Wednesday, November 17. All written comments may be reviewed here.

The Groundwater Sustainability Plan Summary (8 pages) provides a clear and concise overview of the document.

The Groundwater Sustainability Plan (1,336 pages) is the final document which was adopted by the Board on November 17, 2021.


Santa Margarita Basin Groundwater Sustainable Plan Final Draft. November 3, 2021
Cover, Acknowledgements & Executive Summary
Section 1. Introduction
Section 2. Plan Area and Basin Setting
Section 3. Sustainable Management Criteria
Section 4. Projects &Management Actions
Section 5. GSP Implementation
Appendix 1A.Definition of SGMA and Groundwater Terms
Appendix 1B. Joint Powers Agreement Appendix
Appendix 1C. Santa Margarita Groundwater Agency Guiding Principles
Appendix 2A. Communications and Engagement Plan
Appendix 2B. Well Hydrographs
Appendix 2C. Well Chemographs
Appendix 2D. Santa Margarita Basin Groundwater Model Updates and Simulations for Groundwater Sustainability Planning
Appendix 2E. Aquifer-Specific Groundwater Budgets
Appendix 3A. Representative Monitoring Point Hydrographs with Sustainable Management Criteria
Appendix 3B. Representative Monitoring Point Chemographs with Sustainable Management Criteria
Appendix 4A.Full Project and Management Action Summary Table