Paso Basin Aerial Groundwater Mapping Pilot Study

Project Status Update

On November 7, 2019, the groundwater mapping survey over the Paso Basin was successfully completed.  Draft survey reports will be added to the table below as they become available.




Hydrogeologic Conceptual Model in Paso Robles, Traditional HCM Report                                                  

This report was prepared to improve the understanding of the hydrology in the central portion of the Paso Robles Basin based on geophysical data collected in November 2019.

Click here to view the report

October 2020: Draft Data Report SkyTEM Survey, Paso Robles Basin by SkyTEM Airborne Surveys Worldwide

This report covers data acquisition, technical specifications, data processing and presentation of the SkyTEM312M survey flown in November 2019 in the Paso Robles Basin, CA.  

Click here to view the report

Multipoint Statistical Report: Application of a multipoint method to assess potential recharge areas in San Luis Obispo County, California, U.S.A.  The MPS report discusses the application of a multipoint statistics method to assess potential recharge areas in Pilot Study area in the Paso Robles Basin. Click here to view this report

DWR's Upcoming AEM Surveys

The California Department of Water Resources (DWR), together with Ramboll, GEI, Sinton Helicopters and SkyTEM, will conduct airborne electromagnetic (AEM) geophysical surveys in the Salinas Valley, Paso Robles, and Cuyama Valley groundwater basins, as well as limited portions of the Atascadero Basin and Adelaida Area. These surveys, which will begin in mid-July, will help improve understanding of groundwater resources and support local management efforts in their goals to implement the Sustainable Groundwater Management Act (SGMA).

Watch this short video ( to learn more about the AEM geophysical method, or visit DWR's AEM project webpage:

Got questions? Please email DWR at [email protected]

Recent Informational Presentations

Paso Basin Cooperative Committee Meeting - April 28, 2021 @ 4:00 p.m.

Agenda item 7 - Receive presentation on Paso Basin Aerial Groundwater Mapping Pilot Study

  • Click here to view the agenda, staff report, and instructions to participate in the virtual meeting

County Board of Supervisors Meeting - April 20, 2021 @ 9:00 a.m.

Agenda item 35 - Receive and file a presentation of the Paso Basin Aerial Groundwater Mapping Pilot Study

  • Click here to view the staff report and supporting documents
  • Click here to view the agenda and instructions to participate in the virtual meeting

Technology Flight Demonstration

The County recently held a question and answer session and flight demonstration for the public. To view local news coverage of the event, click here!

Pilot Study Goals

The goal of the pilot study is to acquire survey data to help us make better informed decisions about managing our groundwater resources. Survey data is collected using aerial groundwater mapping technology to characterize and map out the layers and extent of clays, silts, sands, and gravels to a depth of approximately 1000 to 1400 feet below the ground surface. Existing well data will be used to verify the survey results. This pilot study will enhance Sustainable Management Groundwater Act (SGMA) related groundwater modeling and provide a better picture of our groundwater system.

The video above provides an overview of AEM technology and demonstrates how this type of groundwater mapping technology is used. (Video: Stanford University)

Archived News & Announcements

Click on the link above to view archived news and study announcements.         

Frequently Asked Questions

Contact Public Works via web form, email, or call us at (805) 781-5252.