Atascadero Groundwater Basin

The "Atascadero Area Subbasin", DWR Bulletin 118 Basin No. 3-004.11, was subdivided from the "Paso Robles Area Subbasin" (of the Salinas Valley Groundwater Basin) in 2016 based on information that showed the Rinconada Fault is a significant barrier to groundwater flow. The Paso Robles Formation makes up most of the water-bearing sediments for both subbasins and the lateral (outer) extents are primarily defined by the contact with the Monterey Shale (bedrock). The boundary between the Paso Robles Subbasin and the Atascadero Subbasin is defined by the Rinconada Fault.

In 2015, the State legislature approved a new groundwater management law known as the Sustainable Groundwater Management Act (SGMA). SGMA requires that high and medium priority basins comply with the new law. DWR has designated the Atascadero Groundwater Basin as a very low priority basin. 


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Atascadero Groundwater Basin Website

Meeting Information

The Atascadero Basin GSA Executive Committee meetings are scheduled for the first Wednesday of the first month of each quarter and will include members of the Executive Committee and selected members of the consulting team as needed to support the meeting agenda. These are public meetings that are noticed on the Atascadero Basin website (http://atascaderobasin.com/) and the Atascadero Basin Groundwater Communication Portal (portal.atascaderobasin.com/).

How do I get involved?

For more information please read the Atascadero Basin FAQ

Interactive Map of the Atascadero Groundwater Basin within SLO County 

Click the link above to access the SGMA Interactive Data Viewer for the Atascadero  Groundwater Basin! This is an interactive mapping system to help you to navigate around the Atascadero Groundwater Basin by panning, zooming, or searching for a specific parcel or street address that you would like to locate. There are different map layers that can be shown and superimposed in this interactive mapping system such as boundaries of groundwater basins, cities, roads, SGMA eligible entities, and others by checking the layer names indicated on the left panel layer menu. To search and locate a specific APN or street address on the map:

  1. Enter either the nine-digit parcel number (APN) including hyphens or the complete street address in the “Search...” bar on the upper right hand corner of the map screen and then click on the search button to locate it. The APN or street address that you just entered will appear on the left panel and a location marker will show up on the map to identify the location.
  2. Click on the APN or street address name shown on the left panel layer menu will zoom in to the specified location for a close-up look.

Local Public Agencies in the Atascadero Basin

  • Atascadero Mutual Water Company
  • City of Atascadero
  • City of Paso Robles
  • Templeton Community Services District

Memorandum of Agreement (MOA) forming the Atascadero Basin Groundwater Sustainability Agency

Sign up for the SGMA Mailing List

Click here to subscribe to the SGMA email notification list!

Related Forms & Documents