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GSA Interactive Map

New!Now that the Final 2016 Bulletin 118 Groundwater Basin Boundaries have been approved, DWR is in the process of coordinating with local agencies and GSAs to review existing GSA GIS shapefiles. Additional information may be requested from a local agency that has already submitted a GSA formation notice to confirm the boundaries of the (revised) basin that agency intends to manage. The GSA Interactive Map will be updated soon.

This interactive map (below) shows the location of local agencies that have notified DWR of their intent to undertake sustainable groundwater management by deciding to become or form a groundwater sustainability agency (GSA). The boundaries of the proposed GSA areas are based on information submitted or approved by those agencies. While DWR makes every effort to provide accurate information, DWR has not reviewed all GSA boundary information contained in this map and makes no warranties as to the suitability of this map for any particular purpose. The GSA Formation Table should be referenced to determine the status of a local agency’s GSA formation notice. Not all GSA areas are shown on the map, as GIS shapefiles may not have been provided. Local agencies or GSAs should be consulted to determine parcel-level detail for proposed or exclusive GSA areas.

The GSA Interactive Map application includes the following layers that can be turned on/off (click the legend icon to show the layer functionality). The bolded layers indicate the layers that are turned on by default.

  • GSA Notice Submitted: The GSA boundaries reflect the area(s) of a basin(s) described in the local agency’s posted notice. The darker color identifies those areas where multiple local agencies have indicated their intent to manage groundwater in the same portion of a groundwater basin(s). These conflicting notices must be resolved by June 30, 2017. (Water Code §10723.8(c) and §10735.2)
  • Exclusive GSAs: These GSAs are designated as “Exclusive GSAs” because no other local agency submitted a conflicting notice within 90 days, or previous GSA formation overlap has been resolved through a coordination agreement.
  • Exclusive Local Agencies: Water Code §10723(c) provides a list of local agencies created by statute to manage groundwater within their respective statutory boundaries. These exclusive local agencies must still decide to form a GSA and notify DWR of their intent to undertake sustainable groundwater management.
  • Adjudications: Water Code §10720.8 provides a list of adjudicated areas.
  • Counties: The boundaries of California’s 58 counties are shown.
  • Bulletin 118 Boundaries Corrected for Waterways and Counties: These boundaries reflect recent administrative changes made by DWR to existing basin boundaries. (Water Code §12924)
  • CASGEM Prioritization: Basins listed as high, medium, low, or very-low priority are shown. (Water Code §10722.4)
  • Bulletin 118 Basins: These are the boundaries listed in Bulletin 118-2003. These boundaries are subject to change. (Water Code §10722 et seq.)

If you have questions related to GSAs or have comments related to the interactive map please contact Mark Nordberg at The GSA Interactive Map was last updated on August 5, 2016.